Remove builds using obsolete OSs
Description
As EL7 is going out of support this weekend, this MR updates all the appropriate CI jobs to use EL8 instead of EL7 and removes the EL7 RPM builds.
API Changes and Justification
Backwards Compatible Changes
-
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
-
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.