Fix "Set either 'tiered_rates' or 'tag_rates' but not both" error

[dlabrecq]

Fix "Set either 'tiered_rates' or 'tag_rates' but not both" error
https://redhat.atlassian.net/browse/COST-7330

[gemini-code-assist]

Code Review

This pull request modifies the RateContent component in rateContent.tsx to explicitly initialize tag_rates and tiered_rates as undefined before spreading the values object. This change ensures that only one of these mutually exclusive properties is active in the final object. There are no review comments to address, and I have no further feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.93%. Comparing base (d5e22e6) to head (abcd81d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5194   +/-   ##
=======================================
  Coverage   78.93%   78.93%           
=======================================
  Files         742      742           
  Lines       16830    16830           
  Branches     4050     4047    -3     
=======================================
  Hits        13284    13284           
- Misses       3351     3354    +3     
+ Partials      195      192    -3     

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