Add NumaflowControllerRollout CRD name validation

[chandankumar4]

Fixes #7

Modifications

• Add CRD validation to support only name for numaflowControllerRollout to prevent having more than 1 resource in a namespace

Verification

• Verified in local kubernetes cluster

[chandankumar4]

In the unit test you are working one, we can add a test case for it. Thanks!

Sure, Have created a separate PR for it: https://github.com/numaproj/numaplane/pull/53