Output notx 6846 v6

[catenacyber]

Link to redmine ticket:
https://redmine.openinfosecfoundation.org/issues/6846

Describe changes:

• output/alert: do not use tx_id 0 when there is no transaction

#10633 rebased to get green CI

[codecov]

Codecov Report

Attention: Patch coverage is 89.47368% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 82.65%. Comparing base (e41c2f1) to head (50e2bbd).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10655      +/-   ##
==========================================
- Coverage   82.69%   82.65%   -0.04%     
==========================================
  Files         926      926              
  Lines      247574   247586      +12     
==========================================
- Hits       204719   204645      -74     
- Misses      42855    42941      +86     

Flag	Coverage Δ
fuzzcorpus	63.96% <89.47%> (-0.08%)	⬇️
suricata-verify	61.85% <89.47%> (-0.03%)	⬇️
unittests	62.20% <36.84%> (-0.01%)	⬇️

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

[suricata-qa]

Information: QA ran without warnings.

Pipeline 19549

[catenacyber]

Rebased in #10876