feature: eliminate the need for "oc adm policy add-scc-to-user anyuid" in OCP install

[pdettori]

Feature Description

Without oc adm policy add-scc-to-user anyuid -z kubeflex-controller-manager -n kubeflex-system the creation of vcluster fails:

(⎈|cp1:default)$ kflex create cp2 --type vcluster
✔ Checking for saved initial context...
✔ Switching to initial context...
✔ Creating new control plane cp2 of type vcluster ...
◐ Waiting for API server to become ready...^C
(⎈|admin:N/A)$ k get cps
NAME   SYNCED   READY   TYPE       AGE
cp1    True     True    k8s        10m
cp2    False    False   vcluster   9m22s
(⎈|admin:N/A)$ k get cps cp2 -o yaml
apiVersion: tenancy.kflex.kubestellar.org/v1alpha1
kind: ControlPlane
metadata:
  creationTimestamp: "2024-02-15T02:59:48Z"
  finalizers:
  - kflex.kubestellar.org/finalizer
  generation: 1
  name: cp2
  resourceVersion: "157045"
  uid: 96ed42db-29a1-44eb-ac3f-9f8fa149fe8b
spec:
  backend: shared
  type: vcluster
status:
  conditions:
  - lastTransitionTime: "2024-02-15T02:59:48Z"
    lastUpdateTime: "2024-02-15T02:59:48Z"
    message: ""
    reason: Unavailable
    status: "False"
    type: Ready
  - lastTransitionTime: "2024-02-15T02:59:48Z"
    lastUpdateTime: "2024-02-15T02:59:48Z"
    message: 'error initializing dir for helm setup mkdir /.config: permission denied'
    reason: ReconcileError
    status: "False"
    type: Synced
  observedGeneration: 0

Proposed Solution

Set helm library to use a temp directory to avoid the permissions issue in OCP.

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Additional Context

No response