[Identity] Prepare release

[pvaneck]

Removing beta feature for this patch release.

[Copilot]

Pull request overview

Prepares azure-identity for the 1.25.2 patch release by backing out the beta-only WorkloadIdentityCredential “identity binding proxy” (token proxy) implementation and its tests, and updating release metadata.

Changes:

• Removed enable_azure_proxy / token-proxy support code paths from WorkloadIdentityCredential (sync + async) and deleted the related internal transport implementations.
• Removed the extensive token-proxy test coverage from test_workload_identity_credential*.py.
• Updated package release metadata: version set to 1.25.2, changelog updated, and PyPI classifier set to Production/Stable.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
sdk/identity/azure-identity/azure/identity/_credentials/workload_identity.py	Removes token-proxy/enable_azure_proxy support and related constants/helpers.
sdk/identity/azure-identity/azure/identity/aio/_credentials/workload_identity.py	Async counterpart: removes token-proxy/enable_azure_proxy support and transport factory.
sdk/identity/azure-identity/azure/identity/_constants.py	Removes AKS token-proxy environment variable constants.
sdk/identity/azure-identity/azure/identity/_internal/token_binding_transport_mixin.py	Deletes token-proxy transport mixin implementation.
sdk/identity/azure-identity/azure/identity/_internal/token_binding_transport_requests.py	Deletes sync requests transport implementation for token-proxy support.
sdk/identity/azure-identity/azure/identity/aio/_internal/token_binding_transport_aiohttp.py	Deletes aiohttp transport implementation for token-proxy support.
sdk/identity/azure-identity/azure/identity/aio/_internal/token_binding_transport_asyncio.py	Deletes asyncio-requests fallback transport implementation for token-proxy support.
sdk/identity/azure-identity/tests/test_workload_identity_credential.py	Removes token-proxy related tests; keeps core token-file behavior tests.
sdk/identity/azure-identity/tests/test_workload_identity_credential_async.py	Removes token-proxy related tests; keeps core async token-file behavior tests.
sdk/identity/azure-identity/pyproject.toml	Updates development status classifier to Production/Stable.
sdk/identity/azure-identity/azure/identity/_version.py	Sets version to 1.25.2.
sdk/identity/azure-identity/CHANGELOG.md	Updates top entry to 1.25.2 (2026-02-10) and removes the prior unreleased beta header.