LPS-45866 Update layout priorities only when all site pages marked for publish except deleted ones
LPS-45866 Set the next possible priority value to all the newly imported layout just like how we add new ones
LPS-45866 Add integration test
LPS-45866 Add explanation message why it's a return instead of the typical for - continue
LPS-45866 SF
LPS-45866 Update to the new test framework
LPS-45866 SF