[Expressive] Replace no label preference group with...

[Expressive] Replace no label preference group with SettingsTitlelessPreferenceCategory to add proper padding

- SettingsTitlelessPreferenceCategory will use expressive layout to add padding to separate different preference categories and use no padding version for non-expressive style
- Removed unused preference_category_no_label after this change

Bug: 378501860
Test: presubmit + manual
Flag: com.android.settingslib.widget.theme.flags.is_expressive_design_enabled
Change-Id: Ia9722bbbee2f747ca9a13e04e6a947da7ad363f2