Add Vertex AI Search Deploy Index to Endpoint

[AndrasSandor]

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Description

An additional resource or and update google_vertex_ai_index is needed to be able to deploy indexes to endpoints.

https://cloud.google.com/vertex-ai/docs/vector-search/deploy-index-vpc#deploy_index_default-drest

New or Affected Resource(s)

google_vertex_ai_index_endpoint and google_vertex_ai_index

[roaks3]

This appears to be a duplicate of #12818, which captures the work to manage deployed indexes

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
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