Use executors for loading bubble view info

Remove deprecated async task when inflating bubbles.
Use shell background and main executors instead.

Bug: 353894869
Test: atest WMShellRobolectricTests:BubbleViewInfoTaskTest
Test: atest WMShellMultivalentTestsOnDevice:BubbleViewInfoTaskTest
Test: atest BubbleViewInfoTest
Flag: com.android.wm.shell.bubble_view_info_executors

Change-Id: I75cc882f5f5c489f7eb947a27646bc2fbba438fa