Cherry-picking error for 633db0ff0c9df375b62e3c70ed6cd6fe80d878bc

[github-actions]

gitstream tried to cherry-pick commit 633db0ff0c9df375b62e3c70ed6cd6fe80d878bc from https://github.com/kubernetes-sigs/kernel-module-management but was unable to do so.

Commit message:

Making ImagePullPolicy in NMC optional

Currently ImagePullPolicy has a kubebuilder instruction for default
value, which automatically makes it a required field. In previous
version, this field was optional, meaning: when upgrading KMM operator,
the upgrade will fail , since NMC object will be missing the required
field
This commit keep the default value, but makes this field optional, in
order to solve the upgrade issue

Please cherry-pick the commit manually.

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Error:

could not cherry-pick: could not run a command 0 before committing: exit status 1

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Upstream-Commit: 633db0ff0c9df375b62e3c70ed6cd6fe80d878bc