Description of problem:
foreman-maintain will try to re-enable sync plans that don't exist anymore if there are references to them on the data.yml file.

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

Satellite 6.9

How reproducible:

Steps to Reproduce:
1. Create 2 sync plans
2. Disable sync plans using foreman-maintain:

~~~

1. foreman-maintain advanced procedure run sync-plans-disable
   Running ForemanMaintain::Scenario
   ================================================================================
   disable active sync plans:
   \ Total 2 sync plans are now disabled. [OK]
   --------------------------------------------------------------------------------
   ~~~

3. Remove one of the sync-plans

~~~

1. hammer sync-plan delete --id 4
   Sync plan destroyed.
   ~~~

4. Try enabling sync plans back:

~~~

1. foreman-maintain advanced procedure run sync-plans-enable
   Running ForemanMaintain::Scenario
   ================================================================================
   re-enable sync plans:

   re-enabling sync plans [FAIL] Could not update the sync plan: Could not find sync_plan resource with id 4. Potential missing permissions: edit_sync_plans -------------------------------------------------------------------------------- Scenario [ForemanMaintain::Scenario] failed.

The following steps ended up in failing state:

[sync-plans-enable]

Resolve the failed steps and rerun
the command. In case the failures are false positives,
use --whitelist="sync-plans-enable"
~~~

Actual results:
Fail to re-enable sync plans

Expected results:
All valid sync plans would be enabled

Additional info:

BZ#1717020 was about the exact same thing and is supposed to be fixed on 6.6, however we can see it in 6.9.