[Build] Move all fast pull-request checks to checks.yml

Author: HannesWell

.github/workflows/pr-checks.yml

@@ -10,6 +10,10 @@ on:
     branches: [ master ]
 
 jobs:
+  check-freeze-period:
+    uses: eclipse-platform/eclipse.platform.releng.aggregator/.github/workflows/verifyFreezePeriod.yml@master
+  check-merge-commits:
+    uses: eclipse-platform/eclipse.platform.releng.aggregator/.github/workflows/checkMergeCommits.yml@master
   check-versions:
     uses: eclipse-platform/eclipse.platform.releng.aggregator/.github/workflows/checkVersions.yml@master
     with: