detect/transforms: test in place modifications of buffers

[catenacyber]

Link to ticket: https://redmine.openinfosecfoundation.org/issues/
https://redmine.openinfosecfoundation.org/issues/7409

Describe changes:

• detect/transforms: fix and test in place modifications of buffers (aka do not use memcpy)

[catenacyber]

Rust clippy fixed in #12194

[codecov]

Codecov Report

Attention: Patch coverage is 98.86364% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.17%. Comparing base (ae10fc3) to head (2ff4a47).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #12193   +/-   ##
=======================================
  Coverage   83.16%   83.17%           
=======================================
  Files         912      912           
  Lines      257066   257124   +58     
=======================================
+ Hits       213797   213855   +58     
  Misses      43269    43269           

Flag	Coverage Δ
fuzzcorpus	61.01% <72.72%> (+0.03%)	⬆️
livemode	19.54% <0.00%> (+0.12%)	⬆️
pcap	44.43% <24.24%> (+<0.01%)	⬆️
suricata-verify	62.71% <90.90%> (+<0.01%)	⬆️
unittests	59.19% <93.18%> (+0.01%)	⬆️

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