Refactor BrandingPhoneProvider: Replace MarshalJSON with reset Method

[developerkunal]

🔧 Changes

• Replaced MarshalJSON method with a reset method for BrandingPhoneProvider
• Removed custom JSON marshaling logic, as it is no longer needed
• Added a reset function to clear specific fields (ID, Channel, Tenant)

📚 References

N/A

🔬 Testing

• Verified that reset correctly clears the required fields
• Ensured no regressions in existing behavior related to BrandingPhoneProvider
• Ran unit tests to confirm expected behavior

📝 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 95.61%. Comparing base (59f33dd) to head (0a1e74d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #514      +/-   ##
==========================================
- Coverage   95.61%   95.61%   -0.01%     
==========================================
  Files          57       57              
  Lines       11276    11269       -7     
==========================================
- Hits        10782    10775       -7     
  Misses        373      373              
  Partials      121      121              

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