vikkyomkar: [Cleanup] Removes usage of the k8s-master label (version marker)

JobBuild
93626
08-01 11:07
f505f10e
08-01 11:05
pull-kubernetes-bazel-build 1289517644579344388
pull-kubernetes-bazel-test 1289517644579344385
pull-kubernetes-conformance-kind-ga-only-parallel 1289517644587732994
pull-kubernetes-dependencies 1289517644579344384
pull-kubernetes-e2e-gce 1289517644587732993
pull-kubernetes-e2e-gce-100-performance 1289517644604510208
pull-kubernetes-e2e-gce-device-plugin-gpu 1289517644587732992
pull-kubernetes-e2e-gce-ubuntu-containerd 1289517644596121601
pull-kubernetes-e2e-kind 1289517644596121602
pull-kubernetes-e2e-kind-ipv6 1299024588595793920 1290231215747502081 1289517644579344386
pull-kubernetes-integration 1290231215747502082 1289517644579344387
pull-kubernetes-kubemark-e2e-gce-big 1289517644608704512
pull-kubernetes-node-e2e 1289517644596121600
pull-kubernetes-typecheck 1289517644604510209
pull-kubernetes-verify 1290231215747502080 1289541420591353856 1289517644608704513