Address review comments for fade manager clear APIs

Update clear APIs to align with the standard practice.
These APIs now clear the respective lists instead of
just removing a single element.

Bug: 318430127
Bug: 319321475
API-Coverage-Bug: 308666800
Test: atest FadeManagerConfigurationUnitTest
Change-Id: Ia8acd18ef0b932a42e14477dcd5f521c317ff4f5