system monitory: don't suggest query-only limits

[t-nelson]

Problem

apparently quic uses cmsgs. net.core.optmem_max being specified with a value of 0 still prints a suggestion message, implying that the operator should tune it to zero. this disables cmsg support, breaks quic, prevents user tx receipt and results in leaders building vote-only blocks

Summary of Changes

• add explicit "query-only" knob specification
• don't print recommendations for query-only knobs

[jbiseda]

LGTM

[codecov]

Codecov Report

Merging #34149 (e372ed7) into master (6c62ad7) will increase coverage by 0.0%.
Report is 1378 commits behind head on master.
The diff coverage is 90.9%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #34149      +/-   ##
==========================================
  Coverage    81.8%    81.9%              
==========================================
  Files         766      818      +52     
  Lines      209158   220016   +10858     
==========================================
+ Hits       171210   180267    +9057     
- Misses      37948    39749    +1801