mgr/dashboard: set appropriate baseline branch for applitools

mgr/dashboard: set appropriate baseline branch for applitools

All the dashboard PRs are checked against a baseline branch called
'default' in the visual regresstion testing. This will cause issues when
testing PRs in different branches. For eg: currently our master and
pacific has to save two different screenshots since the two of them
differ slightly.

Disabling the applitools logs as well because its too 'noisy'

Fixes: https://tracker.ceph.com/issues/54190
Signed-off-by: Nizamudeen A <nia@redhat.com>