Revert "[release] Add OLM bundle for v0.28.0 in 0.28.x"

[AObuchow]

We're reverting this commit since the release action failed and re-running the release would increment the minor version used in the script used to build bundles.

What does this PR do?

Reverts commit d402f8ac3ef9085300ea886add0756299cb459ad to re-run the 0.28.0 release.

What issues does this PR fix or reference?

n/a, due to failed release action

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[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AObuchow

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/devfile/devworkspace-operator/blob/0.28.x/OWNERS)~~ [AObuchow] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment