testsys: add image_id label at metal cluster crd

[gthao313]

Issue #, if available:
#69
Description of changes:

testsys: add image_id label to fix metal cluster conflicts

When running metal conformance tests following migration tests, the metal crd for conformance wouldn't be created because it finds the cluster already has a crd. Therefore, the the in-appropriate Bottlerocket version would be tested.
The fix is to add new label imageID to the crd and make both crd unique, so the testsys will create two crds with right bottlerocket version to test conformance and migration.

Test
running metal conformance tests following migration tests and check bottlerocket label.

conformance test label

kubectl --kubeconfig testsys.kubeconfig -n testsys describe resource x86-64-metal-k8s-124-conformance
Name:         x86-64-metal-k8s-124-conformance
Namespace:    testsys
Labels:       testsys/arch=x86_64
              testsys/build-id=5ea1938a
              testsys/cluster=x86-64-metal-k8s-124
              testsys/controlPlaneEndpoint=10.80.50.122
              testsys/imageId=front_net_bottlerocket-metal-k8s-1_24-x86_64-1_15_0-5ea1938a
              testsys/k8sVersion=1.24
              testsys/test-type=conformance
              testsys/type=cluster
              testsys/variant=metal-k8s-1.24

migration test label

$ kubectl --kubeconfig testsys.kubeconfig -n testsys describe resource x86-64-metal-k8s-124-migration
Name:         x86-64-metal-k8s-124-migration
Namespace:    testsys
Labels:       testsys/arch=x86_64
              testsys/build-id=5ea1938a
              testsys/cluster=x86-64-metal-k8s-124
              testsys/controlPlaneEndpoint=10.80.50.122
              testsys/imageId=dfront_net_bottlerocket-metal-k8s-1_24-x86_64-v1_14_3_img_gz
              testsys/k8sVersion=1.24
              testsys/test-type=migration
              testsys/type=cluster
              testsys/variant=metal-k8s-1.24

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