Receive path Initial packet Fuzzer

[gaurav2699]

Description

Describe the purpose of and changes within this Pull Request.

Testing

Do any existing tests cover this change? Are new tests needed?

Documentation

Is there any documentation impact for this change?

[codecov]

Codecov Report

Merging #3896 (ea27341) into main (4425da2) will decrease coverage by 0.12%.
Report is 27 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3896      +/-   ##
==========================================
- Coverage   86.66%   86.55%   -0.12%     
==========================================
  Files          56       56              
  Lines       16854    16901      +47     
==========================================
+ Hits        14607    14628      +21     
- Misses       2247     2273      +26     

see 21 files with indirect coverage changes

[nibanks]

Should try onboarding this to stress.yml too.

[nibanks]

Mostly style stuff, some refactoring; one fix for Linux.