refactor(api): remove unnecessary map() call

[cjihrig]

Which problem is this PR solving?

As far as I can tell, BaggageImpl.prototype.getAllEntries() contains an extraneous call to map() since the array would contain the same values pre- and post-map.

Fixes # N/A

Short description of the changes

This commit removes the extra map() call.

Type of change

None of these. Performance enhancement.

How Has This Been Tested?

• Test suite

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.39%. Comparing base (9a55716) to head (39dc5fa).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6251   +/-   ##
=======================================
  Coverage   95.39%   95.39%           
=======================================
  Files         314      314           
  Lines        9516     9516           
  Branches     2198     2198           
=======================================
  Hits         9078     9078           
  Misses        438      438           

Files with missing lines	Coverage Δ
api/src/baggage/internal/baggage-impl.ts	96.00% <100.00%> (ø)

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