remove koji builds from CI
Description
Currently the CI only builds SL7 RPMs in Koji as part of the nightly pipeline, SL7 is in the process of being retired and it's making less and less sense to test on this platform. This removes the SL7 Koji builds from CI.
API Changes and Justification
Backwards Compatible Changes
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This change does not modify any class/function/struct/type definitions in a public C header file or any Python class/function definitions -
This change adds new classes/functions/structs/types to a public C header file or Python module
Backwards Incompatible Changes
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This change modifies an existing class/function/struct/type definition in a public C header file or Python module -
This change removes an existing class/function/struct/type from a public C header file or Python module
If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.
Review Status
Please provide details on any reviews related to this change and and the associated reviewers.