6/ Remove unhandled recents animation controller calls from the interface

- There were legacy recents animation calls that were not used along
  the shell transition path, which can be removed
- onSwitchToScreenshot was also not used following migration to the
  shell recents transition implementation
- Since there are no other implementations of the aidls, these can
  also be moved into the shell package now

Flag: EXEMPT bugfix
Bug: 359608026
Test: atest NexusLauncherTests
Change-Id: I0f8eb80c2e69bc5345cdf1ae56633dce3e3d2cf1
Signed-off-by: Winson Chung <winsonc@google.com>