Avoid IMS uses overridden configuration

When IMS switches to a secondary display, the WPC will be overriden
to ImeCOntainer's config on the secondary display.
It may lead to the IMS uses wrong config initially.

This CL removes the logic to register IME container's configuration
listener. It is not needed since we change to use
WindowProviderService to listen to IME container update instead.

It also add more logs to collect more information if this approach
is not helpful.

Test: presubmit
Bug: 327766144
Change-Id: Id1d8035a4ca46d08ee0ca7cf6822bb57b49fac63