feat(EDT): Update the preference interaction and visiblity logic

The EDT toggle will be an subsetting in the DarkTheme settings page
- When the Dark Theme main toggle is on, we check the EDT setting to
decide applying normal DarkTheme or EDT now.
- The EDT preference is disabled when DarkTheme is off

Bug: 368721320
Flag: android.view.accessibility.force_invert_color
Test: atest ToggleForceInvertPreferenceControllerTest
Change-Id: I97841c5b2f03c8c0fb37e0be309d15f312bfedbd