[Expressive] Add SettingsTitlelessPreferenceCategory to handle proper padding

- Create SettingsTitlelessPreferenceCategory to use expressive layout when expressive design is used, otherwise use the existing layout
- Added settingslib_expressive_preference_category_no_title.xml to compliant expressive design

Bug: 378501860
Test: manual + presubmit
Flag: com.android.settingslib.widget.theme.flags.is_expressive_design_enabled
Change-Id: Iaf6e2c4c2ee2f11b14c03fc69926e2942ef08bd9