Make lease labels a real label selector for the agent

[twz123]

The lease labels are already converted into a label selector anyways, so allowing the full label selector syntax removes an artificial
constraint.

[kubernetes-prow]

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[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: twz123
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[cheftako]

/ok-to-test