Http2 noalloc header compare 5454 v4

[catenacyber]

Link to redmine ticket: https://redmine.openinfosecfoundation.org/issues/5454

Describe changes:

• http2: remove to_vec in comparisons (no need to alloc)

Replaces #7685 with better style from Jason

[codecov[bot]]

Codecov Report

Merging #7692 (074491f) into master (f3d3274) will decrease coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7692      +/-   ##
==========================================
- Coverage   75.88%   75.87%   -0.02%     
==========================================
  Files         659      659              
  Lines      185668   185668              
==========================================
- Hits       140893   140872      -21     
- Misses      44775    44796      +21     

Flag	Coverage Δ
fuzzcorpus	60.59% <ø> (ø)
suricata-verify	52.56% <ø> (-0.03%)	:arrow_down:
unittests	60.71% <ø> (+<0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

[suricata-qa]

Information: QA ran without warnings.

Pipeline 8482

[victorjulien]

Merged in #7713, thanks!