🐛 remove disableMachineCreate annotation from new machinesets during rolling machine deployment reconciliation

[Patryk-Stefanski]

What this PR does / why we need it:

1. Create a cluster with rolling machine deployment.
2. Change to onDelete machine deployment
3. Make some change to generate new machineSet
4. DisableMachineCreateAnnotation is set on old machineSet, while new machineSet scales up
5. Switch back to rolling machine deployment
6. Removing the change made in step 3 will try to use the old machineSet but new machines wont be created because of the annotation.

The flow above prevents machines from being created with the following error Automatic creation of new machines disabled for machine set . We should remove this annotation during the machine deployment rolling reconciliation.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[Patryk-Stefanski]

/area machinedeployment

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Hi @Patryk-Stefanski. Thanks for your PR.

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[enxebre]

/ok-to-test

[chrischdi]

this duplicates the removal code. Also it would run twice in the onDelete case so we should be able to remove it there.

Maybe also move it to the top of this function.

Caveat: with doing this it won't be possible (anymore) to manually set this annotation on a MS if it is the new machineset for the normal rollout type. But IMHO this should be okay, because the MD controller owns the MS.

[chrischdi]

Could we also add some test coverage for this?