ci: conditionally run coverage based on context (#1391)
ci: conditionally run coverage based on context (#1391)

Description: Updates coverage check to automatically pass for PRs that contain no changes to //library/common. Coverage will always run after a merge to main.
Risk Level: Low
Testing: CI

Signed-off-by: Mike Schore <270e364e708f2af319f244c09ceba52a03dbd980@gmail.com>
envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile