[patch] Mongo remove upgrade assert

[andrercm]

This PR fixes a problem where we were expecting --mongo-v5-upgrade to be passed in when using --no-confirm flag even if the Mongo was already upgraded to v5. The condition to enforce --mongo-v5-upgrade is now inside the parent condition that checks if MongoDB version needs upgrading.

Tests to prove it's working well now:

1. Upgrade Mongo v4 to v5

Interactive mode, warning will still be shown to let users know about the upgrade:

Non-interactive with --no-confirm - it must fail as --mongo-v5-upgrade was not set:

Non-interactive with --no-confirm --mongo-v5-upgrade - it must install update pipeline directly:

2. Upgrade Mongo v5 to v5:

Interactive mode - no warning as no update needed:

Non-interactive with --no-confirm - it must NOT ask for --mongo-v5-upgrade as no update needed:

• Also added an assert to fail early and do not allow Mongo downgrades (currently it's already prevented in ansible-devops but we don't want to get there to fail):