🐛 [release-1.10] Relax minLength for bootstrap.dataSecretName to 0

[damdo]

What this PR does / why we need it:

Manual backport of #12164

Changes the validation for Machine spec's bootstrap.dataSecretName to // +kubebuilder:validation:MinLength=0. This allows an empty string, which is an existing use case for managed MachinePools.

Which issue(s) this PR fixes:

Fixes #12161

/area bootstrap

[damdo]

/assign @sbueringer @mboersma @tamalsaha

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/assign @sbueringer @mboersma @tamalsaha

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[sbueringer]

Thx!

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 4fbb96dc60c2563b1ea9e6a217ad314c9d9b7142

[k8s-ci-robot]

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