Restore rollback support

[dee0sap]

Description

We need to an expedient way to rollback from a bad component version. More specifically, we would like this scenario to be possible

1. v3,9.0 built and rolled out and was good
2. v4.0.0 built and rolled out and at some point determined so bad we need to quickly rollback
3. We update semVer in our ComponentVersion to include "!=v4.0.0"
4. OCM-Controller automatically takes us back to v3.9.0 ( Assuming that repository doesn't have anything newer than 4.0.0 )

Note that we do have the concern that if somehow, perhaps unintentionally, the currently deployed version was removed from the repository then a rollback would be initiated. To defend against that we think we should have logic like this

latestFilteredVersion := getLatestMatchingVersionFromRepo()
currentVersion := getCurrentVersion()
if currentVersion < latestFilteredVersion || ! matchesFilter( currentVersion ) {
// use latestFilteredVersion
}

So this way a rollback is only coming if it has been indicated by the filter and not just because of something happening in the repository.

Done Criteria

• ...
• Code has been reviewed by other team members
• Internal technical Documentation created/updated
• New / changed code is documented
• Analysis of existing tests (Unit and Integration)
• Unit Tests created for new code or existing Unit Tests updated
• Integration Test Suite updated (includes deletion of existing unnecessary Integration Test and/or creation of new ones if required)
• Enduser Documentation updated (if applicable)
• Successful demonstration in Review