chore(php): [Dialogflow] Revert two optional to required fields for dialogflow

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PiperOrigin-RevId: 661351717

Source-Link: https://github.com/googleapis/googleapis/commit/23bf1dd6a357aa6440a8f1c42dc9b9980869b6e7

Source-Link: https://github.com/googleapis/googleapis-gen/commit/54d98d650e643dee6df029165bd151aa57e9fbd1 Copy-Tag: eyJwIjoiRGlhbG9nZmxvdy8uT3dsQm90LnlhbWwiLCJoIjoiNTRkOThkNjUwZTY0M2RlZTZkZjAyOTE2NWJkMTUxYWE1N2U5ZmJkMSJ9

BEGIN_NESTED_COMMIT feat: [Dialogflow] Add Proactive Generative Knowledge Assist endpoints and types feat: Add Generator related services and types feat: Add GenerateStatelessSuggestion related endpoints and types docs: A comment for field name in message .google.cloud.dialogflow.v2.Conversation is changed docs: A comment for field conversation_stage in message .google.cloud.dialogflow.v2.Conversation is changed docs: A comment for field filter in message .google.cloud.dialogflow.v2.ListConversationsRequest is changed docs: A comment for field latest_message in message .google.cloud.dialogflow.v2.SuggestConversationSummaryRequest is changed docs: A comment for field context_size in message .google.cloud.dialogflow.v2.SuggestConversationSummaryRequest is changed docs: A comment for field assist_query_params in message .google.cloud.dialogflow.v2.SuggestConversationSummaryRequest is changed docs: A comment for field latest_message in message .google.cloud.dialogflow.v2.GenerateStatelessSummaryRequest is changed docs: A comment for field max_context_size in message .google.cloud.dialogflow.v2.GenerateStatelessSummaryRequest is changed docs: A comment for field parent in message .google.cloud.dialogflow.v2.SearchKnowledgeRequest is changed docs: A comment for field session_id in message .google.cloud.dialogflow.v2.SearchKnowledgeRequest is changed docs: A comment for field conversation in message .google.cloud.dialogflow.v2.SearchKnowledgeRequest is changed docs: A comment for field latest_message in message .google.cloud.dialogflow.v2.SearchKnowledgeRequest is changed docs: A comment for message HumanAgentHandoffConfig is changed docs: A comment for field live_person_config in message .google.cloud.dialogflow.v2.HumanAgentHandoffConfig is changed docs: A comment for field audio in message .google.cloud.dialogflow.v2.AudioInput is changed fix: Changed field behavior for an existing field parent in message .google.cloud.dialogflow.v2.SearchKnowledgeRequest fix: Changed field behavior for an existing field session_id in message .google.cloud.dialogflow.v2.SearchKnowledgeRequest

PiperOrigin-RevId: 658854047

Source-Link: https://github.com/googleapis/googleapis/commit/dcbd1d4b2cbc19e6ce2226ed706b0dbbfba48788

Source-Link: https://github.com/googleapis/googleapis-gen/commit/feac4cf807f0ab41bd59878af46eb4fd2ece5679 Copy-Tag: eyJwIjoiRGlhbG9nZmxvdy8uT3dsQm90LnlhbWwiLCJoIjoiZmVhYzRjZjgwN2YwYWI0MWJkNTk4NzhhZjQ2ZWI0ZmQyZWNlNTY3OSJ9 END_NESTED_COMMIT

BEGIN_COMMIT_OVERRIDE feat: Add Proactive Generative Knowledge Assist endpoints and types feat: Add Generator related services and types feat: Add GenerateStatelessSuggestion related endpoints and types

END_COMMIT_OVERRIDE

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 13 region tags.

- [Dialogflow/samples/V2/ConversationsClient/generate_stateless_suggestion.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/ConversationsClient/generate_stateless_suggestion.php#L25), tag `dialogflow_v2_generated_Conversations_GenerateStatelessSuggestion_sync` - [Dialogflow/samples/V2/EncryptionSpecServiceClient/get_encryption_spec.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/EncryptionSpecServiceClient/get_encryption_spec.php#L25), tag `dialogflow_v2_generated_EncryptionSpecService_GetEncryptionSpec_sync` - [Dialogflow/samples/V2/EncryptionSpecServiceClient/get_location.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/EncryptionSpecServiceClient/get_location.php#L25), tag `dialogflow_v2_generated_EncryptionSpecService_GetLocation_sync` - [Dialogflow/samples/V2/EncryptionSpecServiceClient/initialize_encryption_spec.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/EncryptionSpecServiceClient/initialize_encryption_spec.php#L25), tag `dialogflow_v2_generated_EncryptionSpecService_InitializeEncryptionSpec_sync` - [Dialogflow/samples/V2/EncryptionSpecServiceClient/list_locations.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/EncryptionSpecServiceClient/list_locations.php#L25), tag `dialogflow_v2_generated_EncryptionSpecService_ListLocations_sync` - [Dialogflow/samples/V2/GeneratorsClient/create_generator.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/GeneratorsClient/create_generator.php#L25), tag `dialogflow_v2_generated_Generators_CreateGenerator_sync` - [Dialogflow/samples/V2/GeneratorsClient/delete_generator.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/GeneratorsClient/delete_generator.php#L25), tag `dialogflow_v2_generated_Generators_DeleteGenerator_sync` - [Dialogflow/samples/V2/GeneratorsClient/get_generator.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/GeneratorsClient/get_generator.php#L25), tag `dialogflow_v2_generated_Generators_GetGenerator_sync` - [Dialogflow/samples/V2/GeneratorsClient/get_location.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/GeneratorsClient/get_location.php#L25), tag `dialogflow_v2_generated_Generators_GetLocation_sync` - [Dialogflow/samples/V2/GeneratorsClient/list_generators.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/GeneratorsClient/list_generators.php#L25), tag `dialogflow_v2_generated_Generators_ListGenerators_sync` - [Dialogflow/samples/V2/GeneratorsClient/list_locations.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/GeneratorsClient/list_locations.php#L25), tag `dialogflow_v2_generated_Generators_ListLocations_sync` - [Dialogflow/samples/V2/GeneratorsClient/update_generator.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/GeneratorsClient/update_generator.php#L25), tag `dialogflow_v2_generated_Generators_UpdateGenerator_sync` - [Dialogflow/samples/V2/ParticipantsClient/suggest_knowledge_assist.php:25](https://github.com/googleapis/google-cloud-php/blob/90660a70608236601cba881adb8cfd5c3c2777f6/Dialogflow/samples/V2/ParticipantsClient/suggest_knowledge_assist.php#L25), tag `dialogflow_v2_generated_Participants_SuggestKnowledgeAssist_sync`

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Owl bot is regenerating pull request 7579... Build name: ZThiZTA2YWMtYWU0Yi00OTQyLWI0ZWUtYTE1MTBjODkxYTI0

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Owl bot is regenerating pull request 7579... Build name: Yjk2NzFiYzAtOWUyOS00NDhiLTgyZmYtODkwNmU1ODU3MTlj