manifests: Remove control-plane label from namespace

[oshoval]

What this PR does / why we need it:
Following https://github.com/kubevirt/cluster-network-addons-operator/pull/1145/files#r796372158
We don't need this label on KMP, and it require busy work on CNAO (see linked issue below).
Hence remove it from the namespace.

Note: the 2nd commit is manual removing from the files, where make generate didn't remove from.

Special notes for your reviewer:
See first bullet at kubevirt/cluster-network-addons-operator#1567

Release note:

None

[oshoval]

/cc @RamLavi

[RamLavi]

Can you run it manually to see that the label doesn't "return" unannounced by kustomize?

[oshoval]

Can you run it manually to see that the label doesn't "return" unannounced by kustomize?

Good point,
tried, it doesn't

we should also include running make generate on the unit-test if we don't already

[RamLavi]

Can you run it manually to see that the label doesn't "return" unannounced by kustomize?

Good point, tried, it doesn't

good.
/lgtm
/approve

we should also include running make generate on the unit-test if we don't already

not sure, but it's a good idea

[kubevirt-bot]

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[oshoval]

Thanks, once there will be a release we can update a little CNAO code (for now we can just remove the code on the 1st bullet)

no rush