Split 'testing' extra to 'testing' and 'coverage'

[befeleme]

Describe the problem/need and solution

Hi! I maintain some Executable Books packages in Fedora (MyST-Parser and whatever it depends on). As a downstream consumer I'd love to build the RPM package as automatically as it gets, without tweaking the upstream configuration too much. During the RPM build I want to run the tests as they are the best indicator of the package health but from my POV coverage is not important at all - it doesn't say anything of the package quality on my level. So with the current extras I need to remove python-cov and coverage from testing extra to get only the "core" testing packages. It would help me to have coverage split to another extra. I guess it would be beneficial also to the other distros package maintainers. I'll be happy to send a PR if you agree with this idea.

Guide for implementation

No response

Tasks and updates

No response

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