v2021pre backports

• 6193fc41 Updating the priority of the above testcase to be Critical
• 70f3983c connman-pan-network-access: Depend on chaiwala-tests
• 7b2bb306 agl-compositor: Add test case
• fd282d82 lava: Extend timeouts due to Minnowboard memory cleaning issue
• 0e3b9c5c gitlab-ci: Fix the pipeline on forks
• 485def7f Remove redundant AUM testcases
• 12068de1 Remove bitrotted WebKit testcases
• e29ccfe9 agl-compositor: Remove the step to enable the development repository
• a6c4d4d1 agl-compositor: Install agl-compositor implicitly
• cf907349 apertis-update-manager-automount: Add error messages