Fix the issue that the length of private namespaces are mis-calculated

[nobodyiam]

What's the purpose of this PR

Fix the issue that the length of private namespaces are mis-calculated

Which issue(s) this PR fixes:

Fixes #5073

Brief changelog

• Fix the logic of shouldAppendNamespacePrefix

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• Write necessary unit tests to verify the code.
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• Update the CHANGES log.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0c21659) 49.60% compared to head (c6a84b4) 49.60%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5078   +/-   ##
=========================================
  Coverage     49.60%   49.60%           
  Complexity     1904     1904           
=========================================
  Files           372      372           
  Lines         11564    11564           
  Branches       1127     1127           
=========================================
  Hits           5736     5736           
  Misses         5488     5488           
  Partials        340      340           

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