detect/var: Restrict var usage to single buffer

[jlucovsky]

Continuation of #13720

Issue: 1412

Extend the checks added for 7549 to include buffers.

Only consider sig matches with compatible ids/lists.

Link to ticket: https://redmine.openinfosecfoundation.org/issues/1412

Describe changes:

• Extend buffer/variable checks to buffers init data
• In strict-mode, do not load rules using variables from different buffers.
• When not in strict mode, issue warning for rules that use variables from different buffers.

Updates:

• Include behavioral change note (see detect/var: Restrict var usage to single buffer #13465) in upgrade notes.
• Doc format fixup (see detect/var: Restrict var usage to single buffer #13509 CI failures)
• s-v rebase
• Modified behavior when mult buffers are in use: Warning if not in strict mode, else error.
• Honor strict-rule-keywords
• Include issue number and file name in warning output.
• Address review comments (see detect/var: Restrict var usage to single buffer #13622)
• Address review comments (see detect/var: Restrict var usage to single buffer #13716)
• Removed extraneous variable (review comment, see detect/var: Restrict var usage to single buffer #13720)

Provide values to any of the below to override the defaults.

• To use a Suricata-Verify or Suricata-Update pull request,
  link to the pull request in the respective _BRANCH variable.
• Leave unused overrides blank or remove.

SV_REPO=
SV_BRANCH=OISF/suricata-verify#2576
SU_REPO=
SU_BRANCH=

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.71%. Comparing base (be605ba) to head (7a0cb13).
⚠️ Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #13793      +/-   ##
==========================================
- Coverage   83.72%   83.71%   -0.01%     
==========================================
  Files        1011     1011              
  Lines      275117   275154      +37     
==========================================
+ Hits       230328   230350      +22     
- Misses      44789    44804      +15     

Flag	Coverage Δ
fuzzcorpus	62.99% <96.10%> (+0.01%)	⬆️
livemode	18.99% <0.00%> (-0.01%)	⬇️
pcap	44.74% <37.66%> (+0.04%)	⬆️
suricata-verify	65.10% <94.80%> (+0.01%)	⬆️
unittests	59.17% <74.02%> (-0.01%)	⬇️

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

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[suricata-qa]

Information: QA ran without warnings.

Pipeline = 27329

[jlucovsky]

Continued in #13809