Revert "Add the redhat-openshift-release-4.12-interop Dashboard to Testgrid"

[droslean]

Reverts #28449

Since it broke our automation, it would be better to revert these changes and fix the generator.

See https://prow.ci.openshift.org/view/gs/origin-ci-test/logs/periodic-prow-auto-testgrid-generator/1620210483418107904#1:build-log.txt%3A34

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[droslean]

/cc @calebevans FYI

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[danilo-gemoli]

/lgtm

[calebevans]

@droslean are we going to be able to add our own configs after the generator is fixed?

CC: @ascerra

[droslean]

@droslean are we going to be able to add our own configs after the generator is fixed?

CC: @ascerra

There is nothing to be fixed. Only to extend the generator to support such cases.

[calebevans]

@droslean sounds good, I'll look into what I can do.

[calebevans]

@droslean it looks like the issue is in this line. I can try re-working the automation, but I can also just change the name of the dashboard to not include "-release-". We used the "-release-" initially for consistency, but we don't need it there.

CC: @ascerra