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

This PR updates the test_playbooks_parallel FMF plan to leverage the newly added epel feature for enabling EPEL in Testing Farm, replacing manual or ad-hoc repo handling.

File-Level Changes

Change	Details	Files
Enable EPEL via the new FMF feature	Added epel: testing-farm flag to plan metadata Removed manual EPEL repo configuration steps Updated FMF minimum version requirement to include the new feature	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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