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

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

- Create SettingsTitlelessPreferenceCategory to use expressive layout when expressive design is used, otherwise use the existing layout

Bug: 378501860
Test: presubmit + manual
Flag: com.android.settingslib.widget.theme.flags.is_expressive_design_enabled
Change-Id: I1164f08e922f73d8c7ced832a1b82eeb634c2137