fix: add warn log insufficient scope for branding templates export

[kushalshit27]

🔧 Changes

fix: add warn log insufficient scope read:custom_domains error for branding templates export

📚 References

#1045

🔬 Testing

Unit test added

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.15%. Comparing base (6b6e12e) to head (35b8939).
Report is 35 commits behind head on master.

Files with missing lines	Patch %	Lines
src/tools/auth0/handlers/branding.ts	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1047   +/-   ##
=======================================
  Coverage   80.14%   80.15%           
=======================================
  Files         125      125           
  Lines        4603     4605    +2     
  Branches      903      903           
=======================================
+ Hits         3689     3691    +2     
  Misses        540      540           
  Partials      374      374           

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