OWLS-86630 - scalingAction.sh needs adjustment in finding latest API version

[alai8]

Update get_domain_api_version in scalingAction.sh to use kubernetes /apis instead of /apis/apiextensions.k8s.io/v1beta1/customresourcedefinites to find the API version for the operator.

Also fixes a missing colon in python script generated for get_min_replicas, and removing it afterwards.

Example of /apis result returned from kubernetes:

{
  "kind": "APIGroupList",
  "apiVersion": "v1",
  "groups": [
    {
     ...
    },
    ...
    {
      "name": "weblogic.oracle",
      "versions": [
        {
          "groupVersion": "weblogic.oracle/v8",
          "version": "v8"
        },
        {
          "groupVersion": "weblogic.oracle/v7",
          "version": "v7"
        }
      ],
      "preferredVersion": {
        "groupVersion": "weblogic.oracle/v8",
        "version": "v8"
      }
    }
  ]
}

get_domain_api_version would return v8 from preferredVersion.version of the group with name weblogic.oracle.

Jenkins result: https://build.weblogick8s.org:8443/job/weblogic-kubernetes-operator-kind-new/3532/testReport/

[lennyphan]

LGTM