Support unprocessed files when Perfetto protologging is not enabled

Some files are not processable by the ProtoLog tool yet because they use newer language features than the java parser we use supports. This means these files will use the default ProtoLog call instead of the generate implementation. The PerfettoProtoLogImpl supports tracing non-processed log messages to Perfetto, but the LogcatOnlyProtoLogImpl which is used when the logging to Perfetto flag is disabled crashes in those cases unless the REQUIRE_PROTOLOGTOOL is set to false. We want to make sure we don't crash in such cases and just warn about the unprocessed file.

Flag: EXEMPT small bug fix
Bug: 358044587
Change-Id: Ibfa1dbfaa2f7db769c245936ebd0cbb005609f2c