ci: use the new epel feature to enable EPEL for testing farm

[richm]

Now that teemtee/tmt#3128 has merged
we can use the new epel feature to enable EPEL for testing farm

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Leverage the newly introduced epel feature in tmt to enable EPEL repository access in the test_playbooks_parallel FMF plan for the testing farm.

File-Level Changes

Change	Details	Files
Enable EPEL via the new epel feature	Add features: ["epel"] to plan metadata Bump tmt requirement to include epel support Remove legacy EPEL setup steps	plans/test_playbooks_parallel.fmf

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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