[ISSUE #10168] Fix GetAllTopicConfigResponseHeader compatibility issue

[gaoyf]

Which Issue(s) This PR Fixes

• Fixes [Bug] GetAllTopicConfigResponseHeader is not backward compatible #10168

Brief Description

GetAllTopicConfigResponseHeader‘s field totalTopicNum should not add annotation: @CFNotNull.

How Did You Test This Change?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.85%. Comparing base (70834e3) to head (0d53698).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #10169      +/-   ##
=============================================
- Coverage      48.95%   48.85%   -0.10%     
+ Complexity     13389    13366      -23     
=============================================
  Files           1373     1373              
  Lines          99928    99928              
  Branches       12909    12909              
=============================================
- Hits           48918    48821      -97     
- Misses         45082    45169      +87     
- Partials        5928     5938      +10     

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