chore(internal): remove go.opencensus.io pattern from leakcheck and thirdpartycheck (googleapis#11487)

Author: quartzmo

internal/leakcheck/leakcheck.go

@@ -29,7 +29,6 @@ import (
 var goroutinesToIgnore = []string{
 	"net/http/transport.go",
 	"net/http/h2_bundle.go",
-	"src/go.opencensus.io/stats/view/worker.go",
 	"testing.Main(",
 	"testing.tRunner(",
 	"testing.(*M).",