Evaluate and address code review feedback post R3 related to deploying Nephio management components on pre-installed k8s cluster

[vjayaramrh]

Review the below code review comments from the PR (nephio-project/test-infra#269)

• evaluate using kind.enabled approach (https://github.com/nephio-project/test-infra/pull/269/files#r1651814068)
• ensure extra variables passed to playbook by user is not lost (https://github.com/nephio-project/test-infra/pull/269/files#r1647776134)
• rename the tag nonkind_k8s to another meaningful such as pre_deployed_k8s, or such. (adds support in scripts for deploying nephio components on real K8S(non-kind) test-infra#269 (comment))

cc: @electrocucaracha @liamfallon @radoslawc @arora-sagar