fix: Exit anchor status monitoring loop on shutdown

[bstasyszyn]

Also, updated witness proof monitor to accelerate the next task time if it is known that more records need to be processed.

closes #1572

[codecov]

Codecov Report

Patch coverage: 98.16% and project coverage change: +0.01 🎉

Comparison is base (7017bf0) 88.19% compared to head (624a208) 88.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1575      +/-   ##
==========================================
+ Coverage   88.19%   88.20%   +0.01%     
==========================================
  Files         227      227              
  Lines       21573    21611      +38     
==========================================
+ Hits        19026    19063      +37     
- Misses       1637     1638       +1     
  Partials      910      910              

Impacted Files	Coverage Δ
pkg/vct/proofmonitoring/monitoring.go	83.85% <91.66%> (-0.72%)	⬇️
pkg/store/anchorstatus/store.go	88.64% <96.29%> (+1.20%)	⬆️
cmd/orb-server/startcmd/params.go	86.47% <100.00%> (+0.17%)	⬆️
cmd/orb-server/startcmd/start.go	67.80% <100.00%> (+0.12%)	⬆️
internal/pkg/log/fields.go	96.93% <100.00%> (ø)

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