Filter out enum members based on stability in JQ helpers

[lmolkova]

We're filtering attributes/signals based on stability, but don't filter members inside them. It results in the issues like open-telemetry/semantic-conventions-java#220 or open-telemetry/semantic-conventions#2275

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.7%. Comparing base (3875115) to head (9862794).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #743   +/-   ##
=====================================
  Coverage   76.7%   76.7%           
=====================================
  Files         65      65           
  Lines       5036    5036           
=====================================
+ Hits        3863    3864    +1     
+ Misses      1173    1172    -1     

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[lquerel]

LGTM