chore(api): re-categorize changelog entries

[pichlermarc]

Which problem is this PR solving?

Some changelog entries ended up in feat. After thinking about it for a bit, I think they're better suited for fix (the type change on DiagConsoleLogger #5478 is a type-level bugfix) and perf the performance improvement for isValidSpanId and isValidTraceId #5714, since it's an internal change.

This was we can avoid having a feature release that does not include any new features, which can cause some incompatibility with SDK versions that people have already installed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.74%. Comparing base (733d6e4) to head (a967f40).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6502   +/-   ##
=======================================
  Coverage   95.74%   95.74%           
=======================================
  Files         364      364           
  Lines       11972    11972           
  Branches     2828     2828           
=======================================
  Hits        11462    11462           
  Misses        510      510           

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