Remove progress bar from final notification.

BugReport notifications are already rate controlled
since ag/31885309. With this, we can remove the
progress bar from final notifications, as its confusing
to the user.
The final notification would not be throttled, as overall
notifications are alrady rate limited.

Bug: 411839579
Test: Manual, TH
Flag: EXEMPT Minor Change
Change-Id: Ibe1390ffee781eb4bba5bbf75b012c8fec05726b