feat: extend githubcredential CR status

[rafalgalaw]

fixes #188

• shows to which repo, orgs or enterprises credentials are tied to
• adds unit tests for credentials controller

---

apiVersion: v1
items:
- apiVersion: garm-operator.mercedes-benz.com/v1beta1
  kind: GitHubCredential
  metadata:
    creationTimestamp: "2024-10-23T13:00:43Z"
    finalizers:
    - garm-operator.mercedes-benz.com/credentials
    generation: 1
    labels:
      app.kubernetes.io/created-by: garm-operator
      app.kubernetes.io/instance: githubcredentials-sample
      app.kubernetes.io/managed-by: kustomize
      app.kubernetes.io/name: githubcredentials
      app.kubernetes.io/part-of: garm-operator
    name: github-pat
    namespace: garm-operator-system
    resourceVersion: "2005"
    uid: c3916b31-1e32-462b-9ac7-ba47fe94a5d6
  spec:
    authType: pat
    description: credentials for mercedes-benz github
    endpointRef:
      apiGroup: garm-operator.mercedes-benz.com
      kind: GitHubEndpoint
      name: github-enterprise
    secretRef:
      key: token
      name: github-pat
  status:
    apiBaseUrl: https://git.i.mercedes-benz.com
    baseUrl: https://git.i.mercedes-benz.com
    conditions:
    - lastTransitionTime: "2024-10-23T13:03:05Z"
      message: ""
      reason: ReconcileSuccess
      status: "True"
      type: Ready
    - lastTransitionTime: "2024-10-23T13:03:05Z"
      message: Successfully fetched GitHubEndpoint CR Ref
      reason: FetchingEndpointRefSuccess
      status: "True"
      type: EndpointReference
    - lastTransitionTime: "2024-10-23T13:03:05Z"
      message: ""
      reason: FetchingSecretRefSuccess
      status: "True"
      type: SecretReference
    id: 1
    repositories:
    - rthalho-test
    - e2e-testing
    uploadBaseUrl: https://git.i.mercedes-benz.com
kind: List
metadata:
  resourceVersion: ""