[release-v1.8] add probes to all deployments

[nak3]

This patch cherry-picks #176
However #176 contains invalid new line in domainmapping-controller.yaml so cherry-pick from upstream knative#13563

/cc @skonto @ReToCode

[nak3]

/cherry-pick release-v1.9

[openshift-cherrypick-robot]

@nak3: once the present PR merges, I will cherry-pick it on top of release-v1.9 in a new PR and assign it to you.

In response to this:

/cherry-pick release-v1.9

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[ReToCode]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nak3, ReToCode

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[openshift-cherrypick-robot]

@nak3: new pull request created: #203

In response to this:

/cherry-pick release-v1.9

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.