Remove aobuchow from code-owners

[AObuchow]

What does this PR do?

• Removing myself as a code-owner of this repo & passing the torch to @dkwon17 :)
• Replacing myself with David in the release GH action workflow
• Replacing myself with David as the maintainer of DWO in the clusterserviceversion template (and the resulting generated file)

What issues does this PR fix or reference?

N/A

Is it tested? How?

N/A

PR Checklist

• E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • v8-che-happy-path: Happy path for verification integration with Che

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AObuchow, ibuziuk

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