[ops] Introduce GitpodWsManagerMk2BackupFailureError and GitpodWsManagerMk2BackupFailureCritical #29273

Job	Run time
create-runner / Create GCE VM	58s
Configure job parameters	7s
Build previewctl	0s
Build Gitpod	1m 35s
infrastructure	0s
Install Monitoring Satellite	0s
Install Gitpod	0s
Run workspace integration tests on main branch	0s
install-app	0s
Run JetBrains update jobs on main branch	0s
Run VS Code update jobs on main branch	0s
Run integration test	0s
delete-runner / Delete ephemeral GCE VM	32s
	3m 12s

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