fix: AMQP health check

[bstasyszyn]

Reuse existing connection when testing AMQP connectivity.

Signed-off-by: Bob Stasyszyn Bob.Stasyszyn@securekey.com

[codecov]

Codecov Report

Merging #1363 (f4a4b5f) into main (be3bc8b) will increase coverage by 0.00%.
The diff coverage is 58.82%.

@@           Coverage Diff           @@
##             main    #1363   +/-   ##
=======================================
  Coverage   87.81%   87.81%           
=======================================
  Files         199      199           
  Lines       18541    18560   +19     
=======================================
+ Hits        16282    16299   +17     
+ Misses       1449     1448    -1     
- Partials      810      813    +3     

Impacted Files	Coverage Δ
cmd/orb-server/startcmd/start.go	68.25% <ø> (+0.33%)	⬆️
pkg/pubsub/mempubsub/mempubsub.go	95.00% <0.00%> (ø)
pkg/httpserver/server.go	77.19% <53.84%> (-6.65%)	⬇️
pkg/pubsub/amqp/amqppubsub.go	88.85% <100.00%> (+0.65%)	⬆️
pkg/vct/proofmonitoring/monitoring.go	86.72% <0.00%> (+2.65%)	⬆️

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