Fix 'No Apps' UI issues of ManageApplications

Fixes below UI issues

- "No Apps" may not show in fragments of profile tab.

  Fix it by using ConstraintLayout to specify alignments
  of each view and removing extra padding.

-- "No Apps" may flicker by moving position.

  The flicker is from unnecessary visibility changes.
  This change integrates empty view visibility
  control in LoadingViewController to simplify code
  and avoid unnecessary visibility changes.

Bug: 189390795
Bug: 183398721
Test: atest com.android.settings.deviceinfo
      make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.deviceinfo
      Manual visual, observe UI
        Settings -> Storage -> Games
        Settings -> Notifications -> App Settings
	Settings > Apps > Special app access > Media management apps
Change-Id: I9a2500f2fd1dd073ab88f26187541964719523d0