[extension/oauth2clientauth] Add Token expiry buffer for oauth2clientauthextension #37334
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Description
Adds an expiry_buffer config to the oauth2client extension, allowing token refresh before expiration. The default buffer is set to 5 m, preventing authentication failures due to token expiration.
Link to tracking issue
Fixes #35148
Testing
passes tests.
Documentation
The README has been updated to include the expiry_buffer config option, with instructions on how to use it and its default value.