Revert "[pm/incremental] start monitoring progress on storage creation"

This reverts commit 31fa0fc9.

Reason for revert: Play data loader doesn't write data to incfs during "Downloading...", so we shouldn't use incfs progress to replace install progress. Reverting this, so that Launcher will display the install progress ring during "Downloading..." using the progress reported from Phonesky.

Change-Id: I124033d725fe488fd337b6ded0bdf319a764b6ca
BUG: 178528778