Coin: make QNX 8.0 x86_64 autotests blocking

The QNX 8.0 QEMU configuration now passes all of its autotests: in
integration 1790509992, 33 modules ran 1692 tests on it with no
failures. Drop InsignificantTests so that QNX 8.0 regressions block
integration, as QNX 7.1 regressions already do.

Pick-to: 6.12
Change-Id: I482349921df052a353a2e8ff2df347b903a05d73
Reviewed-by: Marianne Yrjänä <marianne.yrjana@qt.io>
Reviewed-by: Simo Fält <simo.falt@qt.io>