[Python-buildbots] Removing the RHEL7 buildbots

Hello folks,

RHEL7's has reached the end of its maintenance support phase at the end of June 2024. While the extended maintenance support will continue till 2028, with the Software Collections product being EOL, no new python versions will be added.

The latest supported Python version offered through RHEL7 is Python 3.6, with the main system-python being Python 2.7.

Hence I'd like to remove the RHEL7 buildbots provided by me.

A PR has been sent: https://github.com/python/buildmaster-config/pull/518

-- Regards,

Charalampos Stratakis Senior Software Engineer Python Maintenance Team, Red Hat