Promote sideways ironic grenade tests to non-voting checks

The ironic sideways grenade tests are no functional and passing.
This moves it out of experimental and promotes it to a non-voting
check job on the relevant projects.

Change-Id: Ia44831955e6e921424278c5f342b961efa9d772a
Merge "Promote sideways ironic grenade tests to non-voting checks"