Remove unused ITYPEs

Most of ITYPEs are not used anymore. They were replaced by the runtime-
generated source IDs and the public insets types. This CL removes them.

The remaining ITYPEs are still used by WindowContainerTranscation APIs.
They will be removed later.

Bug: 234093736
Test: Presubmit
Change-Id: Ieac17377a97517ec4a1d149c870ffaa66f6113a8