mgr/dashboard: CLI commands: read passwords from file

mgr/dashboard: CLI commands: read passwords from file

    Fixes: https://tracker.ceph.com/issues/48355
    Signed-off-by: Alfonso Martínez <almartin@redhat.com>
    Signed-off-by: Juan Miguel Olmo Martínez <jolmomar@redhat.com>
    (cherry picked from commit 5d7ee7c1f0ad971fd0079f917e2b44cdef1d6f9f)

     Conflicts:
            qa/tasks/mgr/dashboard/helper.py
            qa/tasks/mgr/dashboard/test_auth.py
            qa/workunits/cephadm/test_dashboard_e2e.sh
            src/pybind/mgr/dashboard/services/access_control.py
            src/pybind/mgr/dashboard/tests/test_access_control.py
            src/pybind/mgr/dashboard/tests/test_iscsi.py
            src/pybind/mgr/dashboard/tests/test_settings.py
              - Resolved conflicts in these files due to code divergence.
              - Removed test_dashboard_e2e.sh as it does not exists in octopus.