[PIP] Split implementation of isPackageActiveInPip for PIP1 and PIP2

This reverts a change made to isPackageActiveInPip() for PIP1 to fix
an issue where we never reset lastPipComponentName. We still need
to investigate this behavior for PIP2 as there are changes in core
that affect how TransitionInfo is being constructed.

Bug: 379013276
Flag: EXEMPT bugfix
Test: manually follow steps in bug report, verify split starts properly
Change-Id: Ie66d5d3efbba13c649dbd63670625b155eeef30d