Move removePackageData to handler thread.

It does a lot of heavy lifting and should not happen under package lock.

Bug: 245997611
Fixes: 245997611
Test: presubmit + boots
Change-Id: If6c044a31b2d22631a7d0ad57efcb9ea86955aa3

services/core/java/com/android/server/pm/InstallPackageHelper.java

@@ -3311,7 +3311,8 @@ final class InstallPackageHelper {
             if (disabledPs == null) {
                 logCriticalInfo(Log.WARN, "System package " + packageName
                         + " no longer exists; its data will be wiped");
-                mRemovePackageHelper.removePackageData(ps, userIds, null, 0, false);
+                mInjector.getHandler().post(
+                        () -> mRemovePackageHelper.removePackageData(ps, userIds, null, 0, false));
             } else {
                 // we still have a disabled system package, but, it still might have
                 // been removed. check the code path still exists and check there's