The "managedFields" patching logic doesn't apply to "namespace" resources during the restoration

[ywk253100]

The managedFields is important for server-side apply as mentioned in #5701.
Velero restores the managedFields in RestoreItem() function, but this function isn't called when restoring the namespace resource: https://github.com/vmware-tanzu/velero/blob/v1.14.1/pkg/restore/restore.go#L739

Vote on this issue!

This is an invitation to the Velero community to vote on issues, you can see the project's top voted issues listed here.
Use the "reaction smiley face" up to the right of this comment to vote.

• 👍 for "I would like to see this bug fixed as soon as possible"
• 👎 for "There are more important bugs to focus on right now"

[reasonerjt]

Keep this in backlog b/c per discussion it's rare namespace be patched and facing conflict.