The deprecated STI gating test definition is removed in favor of
flexible metadata format (fmf). This fixes testing in Testing Farm
which is enabled in CentOS Stream merge requests.
This is not the final version, some workarounds were needed. Most
notable ones are patching sources which is not yet supported by
tmt (test management tool - used to run tests in Testing Farm).
Tmt also does not download rubygems, so a macro was put in place
to avoid errors while trying to copy them in the prep phase of rpmbuild.
To ensure smooth build process in the future, we will test that the new
gating test definition will match the previous result without changing
the package content.
Resolves: RHEL-15217
