fix(auth): Read token_uri from user json

[sai-sunder-s]

If token_uri is provided in the json, we should use that instead of a hardcoded value.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.74%. Comparing base (b3ae1f9) to head (053a590).
Report is 240 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1430       +/-   ##
===========================================
- Coverage   95.89%   66.74%   -29.16%     
===========================================
  Files          34       39        +5     
  Lines        1365     2195      +830     
===========================================
+ Hits         1309     1465      +156     
- Misses         56      730      +674     

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[coryan]

I would like to see a new test for the new functionality. Is it possible to write one?