feat(discoveryengine): add site search engine service

[gcf-owl-bot]

• Regenerate this pull request now.

feat: add search tuning service
feat: add engine support for conversational engine service
feat: support search summarization with citations and references
docs: keep the API doc up-to-date with recent changes

PiperOrigin-RevId: 590625062

Source-Link: googleapis/googleapis@5e2f0b2

Source-Link: https://github.com/googleapis/googleapis-gen/commit/da4276898c106ad7ae8cc3aa55a8c45cf2708fc0
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiZGE0Mjc2ODk4YzEwNmFkN2FlOGNjM2FhNTVhOGM0NWNmMjcwOGZjMCJ9

[snippet-bot]

Here is the summary of changes.

You are about to add 15 region tags.

• internal/generated/snippets/cloudprofiler/apiv2/ExportClient/ListProfiles/main.go:17, tag cloudprofiler_v2_generated_ExportService_ListProfiles_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SearchTuningClient/GetOperation/main.go:17, tag discoveryengine_v1alpha_generated_SearchTuningService_GetOperation_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SearchTuningClient/ListOperations/main.go:17, tag discoveryengine_v1alpha_generated_SearchTuningService_ListOperations_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SearchTuningClient/TrainCustomModel/main.go:17, tag discoveryengine_v1alpha_generated_SearchTuningService_TrainCustomModel_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SiteSearchEngineClient/BatchCreateTargetSites/main.go:17, tag discoveryengine_v1alpha_generated_SiteSearchEngineService_BatchCreateTargetSites_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SiteSearchEngineClient/BatchVerifyTargetSites/main.go:17, tag discoveryengine_v1alpha_generated_SiteSearchEngineService_BatchVerifyTargetSites_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SiteSearchEngineClient/CreateTargetSite/main.go:17, tag discoveryengine_v1alpha_generated_SiteSearchEngineService_CreateTargetSite_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SiteSearchEngineClient/DeleteTargetSite/main.go:17, tag discoveryengine_v1alpha_generated_SiteSearchEngineService_DeleteTargetSite_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SiteSearchEngineClient/DisableAdvancedSiteSearch/main.go:17, tag discoveryengine_v1alpha_generated_SiteSearchEngineService_DisableAdvancedSiteSearch_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SiteSearchEngineClient/EnableAdvancedSiteSearch/main.go:17, tag discoveryengine_v1alpha_generated_SiteSearchEngineService_EnableAdvancedSiteSearch_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SiteSearchEngineClient/FetchDomainVerificationStatus/main.go:17, tag discoveryengine_v1alpha_generated_SiteSearchEngineService_FetchDomainVerificationStatus_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SiteSearchEngineClient/GetSiteSearchEngine/main.go:17, tag discoveryengine_v1alpha_generated_SiteSearchEngineService_GetSiteSearchEngine_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SiteSearchEngineClient/GetTargetSite/main.go:17, tag discoveryengine_v1alpha_generated_SiteSearchEngineService_GetTargetSite_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SiteSearchEngineClient/ListTargetSites/main.go:17, tag discoveryengine_v1alpha_generated_SiteSearchEngineService_ListTargetSites_sync
• internal/generated/snippets/discoveryengine/apiv1alpha/SiteSearchEngineClient/UpdateTargetSite/main.go:17, tag discoveryengine_v1alpha_generated_SiteSearchEngineService_UpdateTargetSite_sync

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[gcf-owl-bot]

Owl bot is regenerating pull request 9158...
Build name: YmU0ODdiNmItZDA2NC00OGE5LTk1NTAtZGIzZTQ2Y2MzYWUz