Reduce code coverage analysis overheads (#16047)
Reduce code coverage analysis overheads (#16047)

* moved regular expressions out of function bodies so they only compile once

* preprocess line to only parse of potential report lines

istio/istio,smawson/istio,geeknoid/istio,smawson/istio,smawson/istio,istio/istio,smawson/istio,geeknoid/istio,geeknoid/istio,geeknoid/istio,smawson/istio,istio/istio,istio/istio,geeknoid/istio,geeknoid/istio,smawson/istio,istio/istio