Don't run operations-apache-config-lint on operations/mediawiki-config

It makes assumptions about WORKSPACE being apache-config and fetches
mediawiki-config. The other way around doesn't work.

Having this run as non-voting is a waste of machine resources.
And it wastes human resources looking at potentialy future tests
that just don't work. Re-enable as voting test when it actually
works.

Also removed section for repo operations/apache-config which
has been discontinued.

Bug: T78782
Change-Id: I3333f5e4500653af66b28c28173d90fe995f4c25