fix: exclude read-only is_default from customDomains

[kushalshit27]

🔧 Changes

Added is_default to the deny-list in to exclude it from create operations and update operations.

This change resolves an issue where the Auth0 Management API recently added a new read-only is_default property to customDomains resources.

📚 References

• Resolves: #1269

🔬 Testing

• Unit tests verify that the is_default property is correctly stripped from update payloads when present in the input

📝 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.41%. Comparing base (553e0f9) to head (94b6e87).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1279   +/-   ##
=======================================
  Coverage   80.41%   80.41%           
=======================================
  Files         146      146           
  Lines        5794     5794           
  Branches     1187     1187           
=======================================
  Hits         4659     4659           
  Misses        645      645           
  Partials      490      490           

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