ExecutableItem: Suppress Axivion warnings about overloading operators

The operands are actually executed in a short-circuiting fashion
when the recipe is executed via QTaskTree.

When the recipe is constructed, both operands are constructed though,
but it's just a description for further execution in a QTaskTree.

Pick-to: 6.11
Task-number: QTBUG-146069
Axivion-Id: qt_Add-ons_qttasktree_dev_linux:SV17
Axivion-Id: qt_Add-ons_qttasktree_dev_linux:SV18
Axivion-Id: qt_Add-ons_qttasktree_dev_linux:SV19
Axivion-Id: qt_Add-ons_qttasktree_dev_linux:SV20
Axivion-Id: qt_Add-ons_qttasktree_dev_linux:SV24
Axivion-Id: qt_Add-ons_qttasktree_dev_linux:SV25
Axivion-Id: qt_Add-ons_qttasktree_dev_linux:SV26
Axivion-Id: qt_Add-ons_qttasktree_dev_linux:SV27
Change-Id: I713f30e7fbb5be3cc45a3f756fcedc0a91bfc70a
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>