Chip and Pill polish

- Various paddings and background color adjustments.
- Chips with attributions now have solid background
- Resting state of pill doesn't have outline
- Minimum heigth for expanded chip

Test: atest NavBarPillScreenshotTest
Test: atest ShortPillScreenshotTest
Bug: 418032398
Flag: com.android.systemui.enable_underlay
Change-Id: I54a3d92c8fb62e64cd5868a8e99ea05a87716e69