Preparation commits for Dns over http2 5773 v10.1

[catenacyber]

Link to redmine ticket:
None preliminary work for https://redmine.openinfosecfoundation.org/issues/5773

Describe changes:

• adds some missing field in schema as revealed by Dns over http2 5773 v4 suricata-verify#1734
• remove some unneeded mut

[catenacyber]

@jasonish would you know if is there a linter for unneeded mut ?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.02%. Comparing base (3b1fecb) to head (71b68f9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #11226   +/-   ##
=======================================
  Coverage   83.02%   83.02%           
=======================================
  Files         942      942           
  Lines      250606   250606           
=======================================
  Hits       208067   208067           
  Misses      42539    42539           

Flag	Coverage Δ
fuzzcorpus	61.28% <100.00%> (ø)
livemode	18.70% <0.00%> (ø)
pcap	44.53% <100.00%> (-0.04%)	⬇️
suricata-verify	61.71% <100.00%> (-0.01%)	⬇️
unittests	60.64% <0.00%> (+<0.01%)	⬆️

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

[jasonish]

@jasonish would you know if is there a linter for unneeded mut ?

I guess not for this case.. For simpler cases of a parameter like mut foo: bool it will, but not for the reference.

[victorjulien]

Merged in #11236, thanks!