PBA should be fired just after PAT and not after PIP or PIT

Today spec put PBA after PIP and PIT which leads to have orphan events for PIP and PIT and thefore register wrong beans in portable extensions if PBA is veto.

Luckily today PBA is not that used but we should ensure vetos happen before any other events to ease work for extension author (didn't see any extension checking the information captured are no more relevant today so this affects pretty much all extensions + it breaks extension and alternative support in most cases).

Proposal is to move up the PBA event after PAT one enabling a straight forward extension API instead of a very complex one for meta capture today.