Revert "Make InputMethod core tests presubmit"

This reverts commit f4f792ef66de8de1df6f25952d4cdaefa0892f66.

Reason for revert: All Core tests run as presubmit without annotation ever since cl/193219608. @Presubmit is redundant.

Bug: 78296014
Change-Id: I7f3b26c9cb5a4aa72591b4e55877b646fa846e73
8 files changed