🐛 Support running alongside other Cluster API pods in the same namespace with leader election enabled

[noamran]

What this PR does / why we need it:
Currently LeaderElectionID is set to the default controller-leader-election-helper. This causes an issue when several Cluster API pods are deployed in the same namespace. Adding a unique ID per service should resolve this.
Which issue(s) this PR fixes :
Following up on kubernetes-retired/cluster-api-bootstrap-provider-kubeadm#271

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[k8s-ci-robot]

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[vincepri]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: noamran, vincepri

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[vincepri]

/ok-to-test