Use real ServiceAccount instead of default

[cwrau]

What steps did you take and what happened:
I tried installing the chart, failing at our policy to not use the default ServiceAccount

What did you expect to happen:
That the chart would create it's own ServiceAccount for the operator.

Anything else you would like to add:
It is best-practice to create specific ServiceAccounts for each component.

Environment:

• Cluster-api-operator version: latest
• Cluster-api version: N/A
• Minikube/KIND version: N/A
• Kubernetes version: (use kubectl version): N/A
• OS (e.g. from /etc/os-release): N/A

/kind bug
[One or more /area label. See https://github.com/kubernetes-sigs/cluster-api-operator/labels?q=area for the list of labels]

[k8s-ci-robot]

This issue is currently awaiting triage.

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