perf(instrumentation-http): remove obvious temp allocations

[Samuron]

Which problem is this PR solving?

Global warming

Fixes # (issue)

Short description of the changes

Remove some obvious temp objects allocations from instrumentation-http. With

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A

Checklist:

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

[codecov]

Codecov Report

Merging #4576 (2f1f83a) into main (9a5688e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4576      +/-   ##
==========================================
+ Coverage   92.84%   92.86%   +0.01%     
==========================================
  Files         328      328              
  Lines        9496     9499       +3     
  Branches     2042     2042              
==========================================
+ Hits         8817     8821       +4     
+ Misses        679      678       -1     

Files	Coverage Δ
...es/opentelemetry-instrumentation-http/src/utils.ts	98.83% <100.00%> (+0.01%)	⬆️

... and 1 file with indirect coverage changes