Testconfig: Enable iOS tests in QtBase stable and dev CI jobs

Enabling test building and running in iOS stages, when built within
QtBase_stable_Intergation or QtBase_dev_Integration jobs.

Stages are forced to succeed until verified.

Change-Id: I5539675183f11d81dc06a4205fb6fdeec9b587c7
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>