feat: [discoveryengine] add Chunk resource in the search response

[gcf-owl-bot[bot]]

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feat: add NO_RELEVANT_CONTENT to Answer API feat: support AlloyDB Connector docs: keep the API doc up-to-date with recent changes

PiperOrigin-RevId: 649156977

Source-Link: https://github.com/googleapis/googleapis/commit/ff081c977ecd64c60e31d365a05f2cb17d0b8b0b

Source-Link: https://github.com/googleapis/googleapis-gen/commit/bbee86257e17d550e7956d42a95d9c1fe5021c88 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLWRpc2NvdmVyeWVuZ2luZS8uT3dsQm90LnlhbWwiLCJoIjoiYmJlZTg2MjU3ZTE3ZDU1MGU3OTU2ZDQyYTk1ZDljMWZlNTAyMWM4OCJ9

[dpebot]

/gcbrun

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 2 region tags.

- [packages/google-cloud-discoveryengine/samples/generated/v1/completion_service.import_completion_suggestions.js:24](https://github.com/googleapis/google-cloud-node/blob/d558221f16fcfa02f13ebed92eeddec5952dde43/packages/google-cloud-discoveryengine/samples/generated/v1/completion_service.import_completion_suggestions.js#L24), tag `discoveryengine_v1_generated_CompletionService_ImportCompletionSuggestions_async` - [packages/google-cloud-discoveryengine/samples/generated/v1/completion_service.purge_completion_suggestions.js:24](https://github.com/googleapis/google-cloud-node/blob/d558221f16fcfa02f13ebed92eeddec5952dde43/packages/google-cloud-discoveryengine/samples/generated/v1/completion_service.purge_completion_suggestions.js#L24), tag `discoveryengine_v1_generated_CompletionService_PurgeCompletionSuggestions_async`

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[dpebot]

/gcbrun

[dpebot]

/gcbrun