feat(authn): improve jwks refresh retry mechanism

[charlie-retzler]

• Address race conditions with fetching JWKS with backoff retry logic
• Reduce concurrent calls to Refresh when multiple requests in retry logic concurrently
• Improve tests to validate number of retries and latency of authentication calls
• Prevent a successful KID that has not needed a refresh from resetting backoff retries

[charlie-retzler]

@ioneyed these are the changes we discussed related to #1299

[tolgaOzen]

Hi @charlie-retzler, thank you for your contribution!