These now regularly run upstream through packit, and thus are reasonably
well gated.
We unfortunately can't switch from STI to FMF completely, as in RHEL the
tests are part of the container-tools module, which uses STI. But the
remaining two ansible files change very rarely, getting rid of the
browser.sh and runt-est.sh duplication gives us most of the benefit
already.
It used to be a dependency of cockpit-podman, but it is still needed on the
first host where cockpit is being accessed - which is the case how
gating is accessing cockpit.
So that it can be called from the container-tools module without
duplication. For technical reasons this requires calling the test entry
script from a different directory, so parameterize it.
Rename the test from "browser" to "cockpit-podman" so that it is
more descriptive within a module test.
Drop the TEST_OS hack, tests of current version recognizes RHEL 8.3 just
fine (and in fact depends on it).
Related: rhbz#1821193
