🔨 Move local coverage logic to its own script (#14166)

scripts/coverage.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -e
+set -x
+
+coverage combine
+coverage report
+coverage html

scripts/test-cov-html.sh

@@ -4,6 +4,4 @@ set -e
 set -x
 
 bash scripts/test.sh ${@}
-coverage combine
-coverage report
-coverage html
+bash scripts/coverage.sh