Specify scheduling constraints for TenantControlPlane pods

[prometherion]

Closes #179.

Still undecided if we should bump up the API version since we're adding a new field, or, since it's v1alpha1 and we're adding fields (thus not modifying old fields), we can just add them.

[bsctl]

@prometherion just add them, that’s the privilege of v1alpha1

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