Allow bubble bar to show on phones if the flag is enabled

* Check for bubble bar on phone being enabled in most places
  tiny taskbar was checking
* Forces taskbar to always be stashed when bubble bar is enabled
* There are a couple of visual issues with the flag enabled:
  - extra space in overview
  - the hotseat is a lil squished on home when bubbles are there

Flag: com.android.wm.shell.enable_bubble_bar_on_phones
Test: manual - enable bubble bar on phones observe that bubble bar
               is enabled and kind of works
Bug: 394869612
Change-Id: I56d3045c78c6c31dcacf16744033b34c9aa5f6e0