Update private space setup string and loading screen title

This includes below changes based on the updated UX mocks:
- Add one more loading screen in setup flow
- Update feature intro text on Setup page
- To swap order of bullets on the setup intro screen
- Update "Private Space" to "private space" in setup flow screens

go/ss/7pVGBSPqezDek47.png
go/ss/ADLX8aXAAGgYQHD.png
go/ss/tYtrGypBgRuXM9V.png
go/ss/3zZfij6JDpudwYR.png
go/ss/BFtWegFZyTueQoT.png
Recording link - b/313654776#comment5

Bug: 313654776, 313882412, 313655290
Test: Verify title and text is same as UX flow
Change-Id: I6a985c4fd6ecbe8ddd11e36bf76a2a9cc8427ef5

src/com/android/settings/privatespace/SetupSuccessFragment.java

@@ -55,7 +55,7 @@ public class SetupSuccessFragment extends InstrumentedFragment {
         final FooterBarMixin mixin = rootView.getMixin(FooterBarMixin.class);
         mixin.setPrimaryButton(
                 new FooterButton.Builder(getContext())
-                        .setText(R.string.privatespace_done_label)
+                        .setText(R.string.private_space_done_label)
                         .setListener(onClickNext())
                         .setButtonType(FooterButton.ButtonType.NEXT)
                         .setTheme(com.google.android.setupdesign.R.style.SudGlifButton_Primary)
@@ -104,6 +104,7 @@ public class SetupSuccessFragment extends InstrumentedFragment {
     }
 
     private void accessPrivateSpaceToast() {
-        Toast.makeText(getContext(), R.string.scrolldown_to_access, Toast.LENGTH_SHORT).show();
+        Toast.makeText(getContext(), R.string.private_space_scrolldown_to_access,
+                Toast.LENGTH_SHORT).show();
     }
 }