Update tests to use custom testing ProtoLog perfetto datasource

This avoids having any interference with the default datasource used by protologging on the device.

Bug: 364255103
Test: atest InternalTests:com.android.internal.protolog
Flag: TEST_ONLY
Change-Id: I53da8388c888094d7e1d47b3e576991ede03ac4b
1 file changed