chore: [dataplex] deprecate SearchEntriesResult.snippets

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chore: deprecate SearchEntriesResult.linked_resource docs: clarify DataQualityRule.sql_assertion descriptions docs: fix links to RuleType proto references

PiperOrigin-RevId: 642731390

Source-Link: https://github.com/googleapis/googleapis/commit/40a290b20d6bf83e60fb32f7f5349ac92fff4825

Source-Link: https://github.com/googleapis/googleapis-gen/commit/2e95263fdc707d4bceb7310ee5eac0919b0a43c2 Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLWRhdGFwbGV4Ly5Pd2xCb3QueWFtbCIsImgiOiIyZTk1MjYzZmRjNzA3ZDRiY2ViNzMxMGVlNWVhYzA5MTliMGE0M2MyIn0=

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