In a cluster with external OIDC environment we need to replace global refresh sync lock in OIDC provider with per-refresh-token one. The work should replace the sync lock that would apply to all HTTP-serving spawned goroutines with a sync-lock that is specific to each of the refresh tokens

Description of problem:

Version-Release number of selected component (if applicable):

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Expected results:

    That reduces token refresh request handling time by about 30%.

Additional info: