Skipping unconnectable providers hides OAuth-only providers when the
deployment has no OAuth credentials configured, which is the case in
e2e. The test asserted SLACK (OAuth-only) is present, so it now fails.
Assert on API-key providers instead, which are connectable regardless
of OAuth configuration.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
e205ff4114