Cleanup around vector in Cosmos

[maumar]

• remove experimental from vector APIs,
• renamed vector index model builder method from ForVector to IsVectorIndex,
• renamed vector property model builder method from IsVector to IsVectorProperty,
• use helper methods rather than extracting annotations directly in validation,
• move some validation to container creation, so that queries are not blocked when Cosmos starts supporting new things (e.g. composite indexes)
• split CosmosVectorType into two annotations (distance function and dimensions) so that we can keep CVT pubternal

Fixes #35895
Fixes #35886
Fixes #35897
Fixes #35903
Fixes #35965

[Copilot]

Pull Request Overview

This PR cleans up Cosmos vector and full-text search APIs by removing experimental flags and renaming vector-related API methods.

• Renames vector index configuration methods from ForVectors to IsVectorIndex and similarly updates full-text index test names.
• Removes #pragma warning disable/restore blocks related to experimental features and shifts some validation logic into container creation.

Reviewed Changes

Copilot reviewed 17 out of 20 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/EFCore.Cosmos.Tests/Infrastructure/CosmosModelValidatorTest.cs	Updates test methods to use IsFullTextIndex/IsVectorIndex and removes unnecessary pragma disables.
test/EFCore.Cosmos.FunctionalTests/VectorSearchCosmosTest.cs	Renames vector index configuration calls and removes pragma warnings.
test/EFCore.Cosmos.FunctionalTests/TestUtilities/CosmosTestStore.cs	Removes pragma disables for experimental warnings during container creation.
test/EFCore.Cosmos.FunctionalTests/HybridSearchCosmosTest.cs	Updates hybrid search tests to use new vector and full-text index method names.
test/EFCore.Cosmos.FunctionalTests/AddHocVectorSearchCosmosTest.cs	Introduces ad hoc tests for composite vector index and vector property on collection navigation.
test/EFCore.Cosmos.FunctionalTests/AddHocFullTextSearchCosmosTest.cs	Adjusts error messages for full text index validations and removes obsolete tests.
src/Shared/EFDiagnostics.cs	Adds a new diagnostic constant for CosmosFullTextSearchExperimental.
src/EFCore.Cosmos/Storage/Internal/CosmosVectorTypeMapping.cs	Removes the Experimental attribute from the CosmosVectorTypeMapping class.
src/EFCore.Cosmos/Storage/Internal/CosmosClientWrapper.cs	Refactors composite vector index validation and updates error messages.
src/EFCore.Cosmos/Metadata/Internal/CosmosVectorType.cs	Removes the Experimental attribute from the CosmosVectorType record.
src/EFCore.Cosmos/Metadata/Internal/CosmosAnnotationNames.cs	Removes the Experimental attribute from vector related annotations.
src/EFCore.Cosmos/Infrastructure/Internal/CosmosModelValidator.cs	Adjusts vector and full text index validation logic and comment descriptions.
src/EFCore.Cosmos/Extensions/*	Replaces Experimental attributes and renames vector index methods accordingly across property and index extension methods.
src/EFCore.Cosmos/Extensions/CosmosDbFunctionsExtensions.cs	Removes Experimental attributes on vector distance functions.

Files not reviewed (3)

• src/EFCore.Cosmos/EFCore.Cosmos.csproj: Language not supported
• src/EFCore.Cosmos/Properties/CosmosStrings.Designer.cs: Language not supported
• src/EFCore.Cosmos/Properties/CosmosStrings.resx: Language not supported

[maumar]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[maumar]

new version up @roji

[roji]

Thanks @maumar, LGTM.

@AndriySvyryd may have more feedback to add but we can address that in a separate PR (I'm thinking possibly about the separate of vector dimensions and distance function). But I don't think there's anything blocking merging.