fix: invalid error response handling during oauth refresh flow

[sanpj2292]

Description

There is a new error being thrown from config-backend's /token endpoint, when the response from downstream service is not valid(i.e, refresh has not happened). We are trying to understand the response and respond correctly.

When config-backend returns INVALID_REFRESH_RESPONSE error, we would retry the event with appropriate error message

Linear Ticket

Resolves INT-2963

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.85%. Comparing base (d29eb14) to head (845ecdb).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5401      +/-   ##
==========================================
+ Coverage   74.76%   74.85%   +0.09%     
==========================================
  Files         439      439              
  Lines       61378    61388      +10     
==========================================
+ Hits        45890    45953      +63     
+ Misses      12943    12894      -49     
+ Partials     2545     2541       -4     

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