In nightly test case <Delete Multi Member>, 'action' was clicked, but the dropdown list was't not shown up, so we should add a comfirmation to make sure the expected element show up. (#8146)
In nightly test case <Delete Multi Member>, 'action' was clicked, but the dropdown list was't not shown up, so we should add a comfirmation to make sure the expected element show up. (#8146)

Signed-off-by: danfengliu <9cf78649f6f3622aa770f93b1666af680107ade3@vmware.com>
reasonerjt/harbor,reasonerjt/harbor,reasonerjt/harbor,wy65701436/harbor,wy65701436/harbor,reasonerjt/harbor,wy65701436/harbor,reasonerjt/harbor,wy65701436/harbor,wy65701436/harbor,wy65701436/harbor,reasonerjt/harbor