Revert prototype RON changes:

Revert "Fix EnRouteView expand button not expanding issue."
This reverts commit 51f6923b.

Revert "[RON] Scaffolding for EnRouteStyle content extraction and view inflation."
This reverts commit e0612f97.

Revert "[RONs] Fix NRCBI to support expanded/headsup state"
This reverts commit ab283522.

Revert "Some UI updates to timer RON per the initial UX mock."
This reverts commit ede75a98.

Revert "[RON] Inflate and bind Rich Ongoing Views"
This reverts commit 87d79dd9.

Revert "[RON] Extract a RichOngoingContentModel from timer notifications for testing."
This reverts commit 5a8fde05.

Flag: android.app.api_rich_ongoing
Flag: com.android.systemui.notification_row_content_binder_refactor
Bug: 343942780
Test: SystemUITests
Change-Id: I484598ea525211227314085d4176e42eb8faade1