Stabilize metric cardinality limits APIs

[jack-berg]

Cardinality limits are stable as of the 1.38.0 spec release.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.08%. Comparing base (83b30b5) to head (48b0384).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6794      +/-   ##
============================================
- Coverage     90.10%   90.08%   -0.02%     
+ Complexity     6545     6543       -2     
============================================
  Files           728      728              
  Lines         19702    19694       -8     
  Branches       1935     1935              
============================================
- Hits          17753    17742      -11     
- Misses         1347     1350       +3     
  Partials        602      602              

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