✨health: Add liveness and readiness probes

[cpanato]

What this PR does / why we need it:
Adding liveness and readiness probes similar we added here: kubernetes-sigs/cluster-api-provider-aws#1487 and kubernetes-sigs/cluster-api-provider-azure#374

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 #

- liveness and readiness probes added

/cc @vincepri

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[k8s-ci-robot]

Hi @cpanato. Thanks for your PR.

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[vincepri]

/ok-to-test
/approve
/assign @jdef

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In response to this:

/ok-to-test
/approve
/assign @jdef

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[jdef]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, jdef, vincepri

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[k8s-ci-robot]

@cpanato: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-cluster-api-provider-gcp-make-conformance	a02bd76	link	/test pull-cluster-api-provider-gcp-make-conformance

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[vincepri]

/lgtm