fix(baggage): ignore legacy baggage keys if not a valid header

[BridgeAR]

The legacy baggage implementation is using headers for transporting the entries. That is causing issues in case the used key is not a valid header. Thus, ignore those while still keeping the baggage entries as before for other usage.

Fixes: #7043

[github-actions]

Overall package size

Self size: 4.38 MB
Deduped: 5.21 MB
No deduping: 5.21 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 2.0.0 | 68.46 kB | 797.03 kB | | dc-polyfill | 0.1.10 | 26.73 kB | 26.73 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.56%. Comparing base (ecce729) to head (aca229e).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7214   +/-   ##
=======================================
  Coverage   84.55%   84.56%           
=======================================
  Files         532      532           
  Lines       22641    22650    +9     
=======================================
+ Hits        19144    19153    +9     
  Misses       3497     3497           

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[pr-commenter]

Benchmarks

Benchmark execution time: 2026-01-11 09:22:42

Comparing candidate commit aca229e in PR branch BridgeAR/2026-01-11-fix-7043 with baseline commit ecce729 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 291 metrics, 29 unstable metrics.