Drop CtsInitTestCases from cts

The test is not eligible for CTS. Reasons:

1. The init behavior does not directly affect app compat. App interact
   with init only for the property service and that part is covered by
the Bionic test already.

2. This test doesn't run against the init binary installed on the
   device. libinit where most of the init functionalities are
implemented is statically linked to this test binary. In other words,
this test is closer to a unit test for init.

3. This test is not compatible with Trunk stable where test and DUT are
   built in different branches. The test depends on several (private)
libraries like libbase and libutils. Since the interfaces of the
libraries may have changed in the main branch, the test binary built
from the old test-dev branch may break.

This change does not remove the test. The test will still run as a unit
test during pre/post submit.

I didn't drop the `Cts` prefix from the name, because that requires
broader changes.

Bug: 320800872
Test: N/A
Change-Id: I1402c08b79b57ad6daa7948fe37f14fbbe36f1d6
(cherry picked from commit 75070b37)