selftests: net: bridge: add test for igmpv3 inc -> is_include report

The test checks for the following case:
   state          report        result                 action
 INCLUDE (A)    IS_IN (B)     INCLUDE (A+B)            (B)=GMI

Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>