Bug 1857211

Description of problem:
We currently use the "install-config" section of the kube-system/cluster-config-v1 to determine the cluster version (https://github.com/konveyor/mig-operator/blob/release-1.2.3/roles/migrationcontroller/tasks/main.yml#L62).

This is not reliable, and there's no guarantee that the install-config key will exist. We have had reported operator failures in customer clusters with the following error:

u001b[0m\n\r\nTASK [migrationcontroller : set_fact] ******************************************\r\n\u001b[1;30mtask path: /opt/ansible/roles/migrationcontroller/tasks/main.yml:62\u001b[0m\n\u001b[0;31mfatal: [localhost]: FAILED! => {\"msg\": \"The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'metadata'\\n\\nThe error appears to be in '/opt/ansible/roles/migrationcontroller/tasks/main.yml': line 62, column 7, but may\\nbe elsewhere in the file depending on the exact syntax problem.\\n\\nThe offending line appears to be:\\n\\n\\n    - set_fact:\\n      ^ here\\n\"}\u001b[0m\n\r\nTASK [migrationcontroller : k8s_status]

Also see the failed lookup: https://github.com/konveyor/mig-operator/blob/release-1.2.3/roles/migrationcontroller/tasks/main.yml#L68

We have a more reliable source proposed here: https://github.com/konveyor/mig-operator/issues/380

Version-Release number of selected component (if applicable):
1.2.3

How reproducible:
It's undetermined what would cause the install-config to be missing, but if it is, the operator will fail on this task every time.