chore: applying 1.15.2 hotfixes to main branch

[atzoum]

Description

Applying 1.15.2 hotfixes to main branch

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

BEGIN_COMMIT_OVERRIDE
chore: advertise gzip support to transformer through X-Feature-Gzip-Support header (#3990)
END_COMMIT_OVERRIDE

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (8c3a723) 71.74% compared to head (2d43a0c) 72.38%.
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3997      +/-   ##
==========================================
+ Coverage   71.74%   72.38%   +0.64%     
==========================================
  Files         368      368              
  Lines       55126    55595     +469     
==========================================
+ Hits        39548    40244     +696     
+ Misses      13320    13068     -252     
- Partials     2258     2283      +25     

Files	Coverage Δ
processor/transformer/transformer.go	94.98% <100.00%> (+0.27%)	⬆️
router/transformer/transformer.go	69.58% <100.00%> (+0.10%)	⬆️

... and 19 files with indirect coverage changes

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