ci: Adding minimal required job set and validation preventing PRs from merging when tests are running#3682

NoelStephensUnity merged 42 commits intodevelop-2.0.0Unity-Technologies/com.unity.netcode.gameobjects:develop-2.0.0from

test-for-all-checks-pass-before-mergingUnity-Technologies/com.unity.netcode.gameobjects:test-for-all-checks-pass-before-mergingCopy head branch name to clipboard