[ROSP] Update StatusBarPopupChip to align with UX specs

Visual changes include:
 - Text overflow is now handled with a fading edge.
 - Added a 2px border.
 - Fixed click indication to match visible area.
 - Added static height and width.

Bug: b/396950722
Flag: com.android.systemui.status_bar_popup_chips

Test: Compare screenshot with provided UX specs.

Change-Id: I12147e15a8e16a50fe7cd43c0cac9d28eb6462fd