Change simctl command to pass full runtime
Change simctl command to pass full runtime

As of Xcode 12.2 beta 1 simctl no longer accepts the short version for
creating a simulator. Instead we need to pass the full runtime.

Closes #311.

RELNOTES: None
PiperOrigin-RevId: 231588111

bazelbuild/rules_apple,bazelbuild/rules_apple,bazelbuild/rules_apple,bazelbuild/rules_apple