feat: Enable Token Retries

[danielbankhead]

Should provide relief from all of the ECONNRESET flakiness we've seen recently.

🦕

[TimurSadykov]

@danielbankhead Hey, does this mark retryable 500, 503, 408, 429 as described in go/auth-correct-retry?

[danielbankhead]

It’s missing 408 (the others are handled by default), however this service endpoint has severed connections causing ECONNRESET errors for us and customers. We needed a short-term fix until we’re unblocked rolling out the updated endpoints (the every other lang use):

• fix: update token endpoints to non-deprecated endpoints #466

I’ll roll out the additional auth retry implementation here and in auth shortly.