Delete devel option, fix problems with tags and remove unneсessary test folders printing

[hurricane642]

Hello everyone,
In this PR we are solving a problem with tags - previously, if certain tags were selected, a "no test folders" error would occur. The error was due to the fact that these same tags were tested at the test_perturbo_for_qe2pert stage, where the number of tests is less, and there really could be no tests with such tags. At the same time, tests for test_perturbo_for_qe2pert test selection are runned in any case - whether we run this test or not (this is how config.py works).
Now the problem is solved with 1 additional if.
Also, we removed the devel option and also removed the unnecessary printing of the line === Test folders == :
Finally, we've renamed epr_info.yaml file to the test_listing.yml file.