DM-37530: Properly retrieve astropy full table metadata with butler.get.

[erykoff]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Base: 84.91% // Head: 84.91% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (21c0981) compared to base (a65f134).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #768   +/-   ##
=======================================
  Coverage   84.91%   84.91%           
=======================================
  Files         267      267           
  Lines       35011    35021   +10     
  Branches     5982     5983    +1     
=======================================
+ Hits        29729    29739   +10     
  Misses       4000     4000           
  Partials     1282     1282           

Impacted Files	Coverage Δ
python/lsst/daf/butler/formatters/parquet.py	92.30% <100.00%> (+0.03%)	⬆️
tests/test_parquet.py	98.62% <100.00%> (+0.01%)	⬆️

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