ceph: make provisioner replicas configurable (backport #8729)

[mergify]

This is an automatic backport of pull request #8729 done by Mergify.
Cherry-pick of ed5f281 has failed:

On branch mergify/bp/release-1.7/pr-8729
Your branch is up to date with 'origin/release-1.7'.

You are currently cherry-picking commit ed5f281a7.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
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Changes to be committed:
	modified:   Documentation/helm-operator.md
	modified:   cluster/charts/rook-ceph/templates/deployment.yaml
	modified:   cluster/charts/rook-ceph/values.yaml
	modified:   cluster/examples/kubernetes/ceph/operator-openshift.yaml
	modified:   cluster/examples/kubernetes/ceph/operator.yaml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   pkg/operator/ceph/csi/spec.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[travisn]

@Madhu-1 Could you resolve the backport conflicts? You may need to open a new backport PR, thanks

[Madhu-1]

closing in favor of #8801