🌱 Defer in-place updates for machines not yet provisioned

[fabriziopandini]

What this PR does / why we need it:
This PR introduces a safeguard that temporarily defers starting an in-place upgrade for machine set machines not yet fully provisioned.

Please note that a similar safeguard is not required in KCP, because it already gates in-place updates with preflight checks ensure all the node involved are healthy (and thus fully provisioned). Nevertheless, I also implemented an additional safeguard in the Machine controller

Part of #12291

/area machinedeployment

[fabriziopandini]

/test

[k8s-ci-robot]

@fabriziopandini: The /test command needs one or more targets.
The following commands are available to trigger required jobs:

/test pull-cluster-api-build-main

/test pull-cluster-api-e2e-blocking-main

/test pull-cluster-api-e2e-conformance-ci-latest-main

/test pull-cluster-api-e2e-conformance-main

/test pull-cluster-api-e2e-latestk8s-main

/test pull-cluster-api-e2e-main

/test pull-cluster-api-e2e-main-gke

/test pull-cluster-api-e2e-mink8s-main

/test pull-cluster-api-e2e-upgrade-1-34-1-35-main

/test pull-cluster-api-test-main

/test pull-cluster-api-test-mink8s-main

/test pull-cluster-api-verify-main

The following commands are available to trigger optional jobs:

/test pull-cluster-api-apidiff-main

Use /test all to run the following jobs that were automatically triggered:

pull-cluster-api-apidiff-main

pull-cluster-api-build-main

pull-cluster-api-e2e-blocking-main

pull-cluster-api-test-main

pull-cluster-api-verify-main

In response to this:

/test

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[fabriziopandini]

/test pull-cluster-api-e2e-main-gke

[sbueringer]

Thank you !

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: ca9b3ea5d36e5f2edfda660e650f33ed4907b3a5

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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