Fixes issue where tests running in forked mode (Test / fork := true)
cannot access resources from src/main/resources, while non-forked
execution works correctly.
Root cause: Context classloader not set: tests using
Thread.currentThread().getContextClassLoader() couldn't find
resources because the context classloader wasn't set to the
URLClassLoader with the classpath
Solution: Set context classloader in ForkTestMain.runTests() to the
URLClassLoader containing the test classpath
**Problem**
Forked tests apparently incorrectly returns success if an exception is thrown
on JDK 17 and up, due to exception failing to persist.
**Solution**
This adds custom codec for Throwable to workaround this issue.
Eugene Yokota
Anatolii Kmetiuk
xuwei-k