Replace usage of TaskInfo#isAppBubble in bubble app compat fixes.

Use Task#mLaunchNextToBubble instead. Calling TaskInfo#isAppBubble would need to run fillTaskInfo for every config change, which may be unnecessarily expensive.

Bug: 384610303
Bug: 384610304
Test: wm presubmit
Flag: com.android.wm.shell.enable_create_any_bubble
Flag: com.android.wm.shell.enable_bubble_app_compat_fixes
Change-Id: Ifd361644973e662523a88b023d27768e73fd17cb