tests: Don't try to parse skip and retry reasons from output
tests: Don't try to parse skip and retry reasons from output

This was prone to unexpected behavior if output would contain any of
these key words.

Now it uses new bots' script `test-failure-policy` introduced in https://github.com/cockpit-project/bots/pull/1840
This script returns only the reason for skipping or retrying and does
not edit the test output directly. Also return code from this script
directly shows if test should be skipped (77) or retried (1).

Therefore we don't need to parse output from this script to figure out
if the test is being skipped or retried nor we don't need to then treat
the output specially since we had to add tap output in the first place.

cockpit-project/cockpit,mvollmer/cockpit,mvollmer/cockpit,garrett/cockpit,mvollmer/cockpit,garrett/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,mvollmer/cockpit,garrett/cockpit,martinpitt/cockpit,martinpitt/cockpit,mvollmer/cockpit,martinpitt/cockpit,garrett/cockpit,martinpitt/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit,garrett/cockpit