feat: [discoveryengine] promote grounding check APIs to v1 GA

[gcf-owl-bot]

• Regenerate this pull request now.

feat: promote answer APIs to v1 GA
feat: promote ranking APIs to v1 GA
feat: add control service APIs
feat: support writing user events for blended engines
feat: support cancelling import operations
docs: keep the API doc up-to-date with recent changes

PiperOrigin-RevId: 637140936

Source-Link: googleapis/googleapis@4f3af9b

Source-Link: https://github.com/googleapis/googleapis-gen/commit/6cdc4fe936fb324cbee143c177f6f74e4955448d
Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLWRpc2NvdmVyeWVuZ2luZS8uT3dsQm90LnlhbWwiLCJoIjoiNmNkYzRmZTkzNmZiMzI0Y2JlZTE0M2MxNzdmNmY3NGU0OTU1NDQ4ZCJ9

[dpebot]

/gcbrun

[snippet-bot]

Here is the summary of changes.

You are about to add 15 region tags.

• packages/google-cloud-discoveryengine/samples/generated/v1/control_service.create_control.js:24, tag discoveryengine_v1_generated_ControlService_CreateControl_async
• packages/google-cloud-discoveryengine/samples/generated/v1/control_service.delete_control.js:24, tag discoveryengine_v1_generated_ControlService_DeleteControl_async
• packages/google-cloud-discoveryengine/samples/generated/v1/control_service.get_control.js:24, tag discoveryengine_v1_generated_ControlService_GetControl_async
• packages/google-cloud-discoveryengine/samples/generated/v1/control_service.list_controls.js:24, tag discoveryengine_v1_generated_ControlService_ListControls_async
• packages/google-cloud-discoveryengine/samples/generated/v1/control_service.update_control.js:24, tag discoveryengine_v1_generated_ControlService_UpdateControl_async
• packages/google-cloud-discoveryengine/samples/generated/v1/conversational_search_service.answer_query.js:24, tag discoveryengine_v1_generated_ConversationalSearchService_AnswerQuery_async
• packages/google-cloud-discoveryengine/samples/generated/v1/conversational_search_service.create_session.js:24, tag discoveryengine_v1_generated_ConversationalSearchService_CreateSession_async
• packages/google-cloud-discoveryengine/samples/generated/v1/conversational_search_service.delete_session.js:24, tag discoveryengine_v1_generated_ConversationalSearchService_DeleteSession_async
• packages/google-cloud-discoveryengine/samples/generated/v1/conversational_search_service.get_answer.js:24, tag discoveryengine_v1_generated_ConversationalSearchService_GetAnswer_async
• packages/google-cloud-discoveryengine/samples/generated/v1/conversational_search_service.get_session.js:24, tag discoveryengine_v1_generated_ConversationalSearchService_GetSession_async
• packages/google-cloud-discoveryengine/samples/generated/v1/conversational_search_service.list_sessions.js:24, tag discoveryengine_v1_generated_ConversationalSearchService_ListSessions_async
• packages/google-cloud-discoveryengine/samples/generated/v1/conversational_search_service.update_session.js:24, tag discoveryengine_v1_generated_ConversationalSearchService_UpdateSession_async
• packages/google-cloud-discoveryengine/samples/generated/v1/grounded_generation_service.check_grounding.js:24, tag discoveryengine_v1_generated_GroundedGenerationService_CheckGrounding_async
• packages/google-cloud-discoveryengine/samples/generated/v1/project_service.provision_project.js:24, tag discoveryengine_v1_generated_ProjectService_ProvisionProject_async
• packages/google-cloud-discoveryengine/samples/generated/v1/rank_service.rank.js:24, tag discoveryengine_v1_generated_RankService_Rank_async

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[dpebot]

/gcbrun