Add more test cases for rpc label filter

[6543]

address #3967 (comment)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.29%. Comparing base (5ed9fc6) to head (e5ba301).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6483   +/-   ##
=======================================
  Coverage   41.29%   41.29%           
=======================================
  Files         431      431           
  Lines       28819    28819           
=======================================
  Hits        11900    11900           
  Misses      15852    15852           
  Partials     1067     1067           

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