[Identity] Add cache hit debug logging

[pvaneck]

Added some additional debug logging to provide insight into access token cache hits.

[Copilot]

Pull request overview

This PR adds debug logging around access token cache hits in the Azure Identity internal clients to give better observability into when tokens are served from cache. It also performs minor signature formatting cleanups (trailing commas) for consistency.

Changes:

• Introduced module-level loggers in managed_identity_client.py and aad_client_base.py and added detailed debug messages when valid cached access tokens are found (including scopes/resource, tenant, TTL, refresh timing, and cache identity).
• Normalized some function signatures by adding trailing commas to **kwargs parameters for consistency and formatting.

Reviewed changes

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

File	Description
sdk/identity/azure-identity/azure/identity/_internal/managed_identity_client.py	Adds a module-level logger and emits a detailed debug log whenever a managed identity access token is returned from cache, including expiry, refresh timing, and cache identity.
sdk/identity/azure-identity/azure/identity/_internal/aad_client_base.py	Adds a module-level logger and emits a detailed debug log on AAD cached token hits (with scopes, tenant, expiry, refresh timing, and cache identity), and updates several method signatures with trailing commas.

[Copilot]

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[xiangyan99]

Do you want to update changelog?