remove backplane-api

[geoberle]

What

we will have the admin api hosting the ARO HCP specific functionality for breakglass credentials.

don't merge before the service status dashboard has been adapted to not report on it anymore

Why

Special notes for your reviewer

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[github-actions]

Please rebase pull request.

[openshift-ci]

@geoberle: The following tests 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/baseimage-generator-images	815b1f3	link	true	/test baseimage-generator-images
ci/prow/config-change-detection	815b1f3	link	true	/test config-change-detection
ci/prow/mega-linter	815b1f3	link	true	/test mega-linter
ci/prow/integration	815b1f3	link	true	/test integration
ci/prow/bicep-lint	815b1f3	link	true	/test bicep-lint
ci/prow/e2e-parallel	815b1f3	link	true	/test e2e-parallel
ci/prow/e2e-images	815b1f3	link	true	/test e2e-images

Full PR test history. Your PR dashboard.

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