In org.openjdk.jmc.flightrecorder.parser.synthetic.SyntheticAttributeExtension,
attributes are transformed into other attributes to make the JMC UI and rules work.

The jdk.ExecutionSample has `sampledThread` in the recording, but that is transformed into eventThread to make all the "in the same thread" functionality work, for example the Show concurrent/Same threads functionality in the selector on the top of every page.

The same needs to be done for the jdk.NativeMethodSample as well.