Add test for DeadObjectException when toggling logcat

Adds a new unit test to verify that when a `DeadObjectException` is thrown by a client during a call to `toggleLogcat`, the exception is caught, the failure is logged, and no `RuntimeException` is propagated.

This ensures the service remains stable even if a registered client process dies unexpectedly.

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Original Change: ag/35136128
Bug: 431235865
Flag: TEST_ONLY

Change-Id: I484a264647ad8ce3ec40c3cf724333ec56e37940