toaster: new customise package-remove modal dlg

toaster: new customise package-remove modal dlg

For customised image package removal, show a different modal dialog that
lists ALL of the packages dependent on this package, with a Remove All
button - implying that all of the dependents will be removed.

[YOCTO #9121]

Signed-off-by: Dave Lerner <dave.lerner@windriver.com>
Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>