feat: change log level for token fetch message to debug #294
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Fixes #293 and provides some context where the message is coming from.
The OAuth2 M2M authenticator currently logs token fetch operations at the Info level in auth/oauth/m2m/m2m.go at line 60. When running applications with Info-level logging enabled, this generates log entries every time a token is fetched or refreshed, which pollutes application logs with operational noise. Its also messing with my Ginkgo tests in CI: onsi/ginkgo#1614 (comment). Libraries should generally avoid logging at Info level during normal operations unless there's actionable information for the application operator. I think this is a pretty standard practice.