Fixes the issue in EndpointExceptionError by changing the format of the error message.

[ubaskota]

The current base class for EndpointResolutionError takes variable-length arguments; kwarg, and passing a positional argument to it returns a TypeError. This fix solves it by passing an argument in a proper format.

[nateprewitt]

Thanks for the PR, @ubaskota! It's probably worth adding a quick note to the description to the effect of:

This PR addresses a miss in the initial implementation of error handling in our EndpointProvider. The missing kwarg for passing the exception message results in an error being raised while trying to raise our EndpointResolutionError.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.18%. Comparing base (b1279af) to head (d89d6e9).
Report is 59 commits behind head on develop.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3296   +/-   ##
========================================
  Coverage    93.18%   93.18%           
========================================
  Files           66       66           
  Lines        14345    14375   +30     
========================================
+ Hits         13367    13396   +29     
- Misses         978      979    +1     

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