Add exclude-annotation LargeTest to CtsAppTestCases

This is needed so merging with cts/tests/app/TEST_MAPPING can be
properly handled to exclude LargeTest. Once b/117880789 is fixed,
we won't need this any more.

Bug: 117880789, 130828971
Test: none
Exempt-From-Owner-Approval: only change test mapping file to fix broken
test suite.

Change-Id: I0369f47e6de6aeca06a9f1e03c6ec00f7c2ee767