snmp: can not be set to detection-only

[liheng562653799]

Fix the snmp app-layer config problem, Normalize the dynamic alproto registration

bug: #8000

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Describe changes:

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[catenacyber]

Thanks for this work.

My main remark is :
Could we have a suricata-verify test for this ?

Also, CI is red because of nits like formatting... Could you fix it ?

For the commit title, I would phrase more like the solution than the problem, something like
snmp: can be set to detection-only

[catenacyber]

Does it mean that we should call SCOutputEvePreRegisterLogger even if SCAppLayerProtoDetectConfProtoDetectionEnabled returns 0 ?

I would not think so

[catenacyber]

I am not sure about the moving of this code to be called in AppProtoRegisterProtoString

Could you explain it in the commit message ?

[codecov]

Codecov Report

❌ Patch coverage is 93.02326% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.44%. Comparing base (93c0409) to head (7f6e248).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14045   +/-   ##
=======================================
  Coverage   84.43%   84.44%           
=======================================
  Files        1011     1011           
  Lines      272251   272261   +10     
=======================================
+ Hits       229876   229909   +33     
+ Misses      42375    42352   -23     

Flag	Coverage Δ
fuzzcorpus	63.41% <88.37%> (+<0.01%)	⬆️
livemode	19.34% <88.37%> (-0.01%)	⬇️
pcap	44.83% <88.37%> (+0.01%)	⬆️
suricata-verify	65.19% <93.02%> (+<0.01%)	⬆️
unittests	59.45% <88.37%> (-0.01%)	⬇️

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