Merge changes from topic "revert-28993807-hdop-cleaup-KJEMMYZIMI" into main

* changes:
  Revert "Clean up fully rolled out DeletePrivateSpaceUnderRestriction"
  Revert "Clean up fully rolled out PolicyEngineMigrationV2Enabled"
  Revert "Clean up fully rolled out HeadlessDeviceOwnerDelegateSec..."
  Revert "Clean up fully rolled out DmrhSetAppRestrictions"
  Revert "Clean up fully rolled out DevicePolicySizeTrackingIntern..."
  Revert "Clean up fully rolled out AllowScreenBrightnessControlOnCope"
  Revert "Clean up fully rolled out PermissionMigrationForZeroTrus..."
  Revert "Clean up fully rolled out HeadlessSingleUserFixes"
  Revert "Clean up fully rolled out HeadlessDeviceOwnerProvisionin..."