Remove cluster profile secrets from ci tools (& from prowgen)

[psalajova]

This PR completely removes the cluster profiles' dependency on the Secret() function in code. prowgen will no longer generate the cluster profile volume and volume mount fields to prow jobs, meaning, if a test in a test config had a cluster profile defined, e.g.:

tests:
- as: e2e-aws-ovn
  steps:
    cluster_profile: aws
    workflow: openshift-e2e-aws

The generated prow job in release/ci-operator/jobs will have the secret-dir arg option, volume and volume mount fields removed.

Before:

...
    spec:
      containers:
      - args:
        ...
        - --secret-dir=/secrets/ci-pull-credentials
        - --secret-dir=/usr/local/e2e-aws-ovn-cluster-profile
        - --target=e2e-aws-ovn
        ...
        volumeMounts:
        - mountPath: /secrets/ci-pull-credentials
          name: ci-pull-credentials
          readOnly: true
        - mountPath: /usr/local/e2e-aws-ovn-cluster-profile
          name: cluster-profile
      serviceAccountName: ci-operator
      volumes:
      - name: cluster-profile
        secret:
          secretName: cluster-secrets-aws
      - name: manifest-tool-local-pusher
        secret:
          secretName: manifest-tool-local-pusher
...

After:

...
    spec:
      containers:
      - args:
        ...
        - --secret-dir=/secrets/ci-pull-credentials
        - --target=e2e-aws-ovn
        ...
        volumeMounts:
        - mountPath: /secrets/ci-pull-credentials
          name: ci-pull-credentials
          readOnly: true
      serviceAccountName: ci-operator
      volumes:
      - name: manifest-tool-local-pusher
        secret:
          secretName: manifest-tool-local-pusher
...

Merging of this PR will probably need to be synced with #4112 .

[psalajova]

/cc @droslean

[openshift-ci]

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[openshift-ci]

@psalajova: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/breaking-changes	f9bc74f	link	false	/test breaking-changes
ci/prow/integration	f9bc74f	link	true	/test integration
ci/prow/security	f9bc74f	link	false	/test security

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[psalajova]

/test e2e