🐛 avoid empty manager field in ControlPlaneProvider when no features gates provided

[afarbos]

What this PR does / why we need it:

Handle cases where manager values is present for other provider than the controlplaneprovider one.
This will make sure the manager field for a specific control plane provider is added only if featureGates for this one are present.

Example with current/v0.15.1 chart:

# Source: cluster-api-operator/charts/cluster-api-operator/templates/infra-conditions.yaml
apiVersion: operator.cluster.x-k8s.io/v1alpha2
kind: ControlPlaneProvider
metadata:
  name: kubeadm
  namespace: capi-kubeadm-control-plane-system
  annotations:
    "helm.sh/hook": "post-install,post-upgrade"
    "helm.sh/hook-weight": "2"
    "argocd.argoproj.io/sync-wave": "2"
spec:
  manager:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[alexander-demicev]

/ok-to-test

[Danil-Grigorev]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Danil-Grigorev

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[furkatgofurov7]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 943e30c2dd44841001a335c922713e66f84f2284