[PiP2] Add UiEvent logs

Add the following missing logs in PiP2
- PICTURE_IN_PICTURE_ENTER
- PICTURE_IN_PICTURE_AUTO_ENTER
- PICTURE_IN_PICTURE_STASH_LEFT
- PICTURE_IN_PICTURE_STASH_RIGHT

Following logs are not added in PiP2 since the functionality is yet not
available
- PICTURE_IN_PICTURE_ENTER_CONTENT_PIP

Fixed also the issue that TaskInfo is not set for PipUiEventLogger in
PiP2, which causes logs not being sent at all.

Flag: com.android.wm.shell.enable_pip2
Bug: 387304221
Test: atest CtsStatsdAtomHostTestCases:UidAtomTests#testPictureInPictureState
Test: $ANDROID_HOST_OUT/bin/statsd_testdrive -terse 90
Change-Id: I0e91c333461a135a498f3b9c06ba7c5f133bd5d3