[WIP] Define a dependency on openshift-cert-manager-operator in OLM bundle

[rzetelskik]

Description of your changes: wip

Which issue is resolved by this Pull Request:
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/kind machinery
/priority important-soon
/cc

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Description of your changes: wip

Which issue is resolved by this Pull Request:
Resolves #

/kind machinery
/priority important-soon
/cc

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[scylla-operator-bot]

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[scylla-operator-bot]

@rzetelskik: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/verify-docs	b53e666	link	true	/test verify-docs

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[rzetelskik]

not needed - https://olm.operatorframework.io/docs/advanced-tasks/adding-admission-and-conversion-webhooks/#certificate-authority-requirements