Should disable WebUI CI tests

[progier389]

WebUI CI test is systematically failing for more than a year now. - and it as always been a bit flaky
And we never were able to find the bandwidth to fix it.
The Idea is to disable it because it is one of the last failing test.

Describe the solution you'd like
My feeling is to add a RUN_WEBUI_TEST environment variable and skip the test if it is not set
(So the test will still be visible and we may re-enable it if we fix it)

Describe alternatives you've considered
Remove "webui" from generate_matrix.py (like snmp was removed) but IMHO it has two drawbacks:

• Remove the test visibility
• Test will still be run by Q/E

Additional context
We need to have a reliable 100% PASS test suite

[vashirov]

We already have an env variable WEBUI to enable the tests, by default they are skipped:

389-ds-base/.github/workflows/pytest.yml

Line 104 in 1b26ed9

sudo docker exec -e WEBUI=1 -e NSSLAPD_DB_LIB=bdb -e DEBUG=pw:api -e PASSWD="${PASSWD}" $CID py.test --suppress-no-test-exit-code -m "not flaky" --junit-xml=pytest.xml --html=pytest.html --browser=firefox --browser=chromium -v dirsrvtests/tests/suites/${{ matrix.suite }}

389-ds-base/dirsrvtests/tests/suites/webui/backup/backup_test.py

Line 19 in 1b26ed9

pytestmark = pytest.mark.skipif(os.getenv('WEBUI') is None, reason="These tests are only for WebUI environment")

So if you want to disable, it's enough to remove this var from the workflows :)