Pass unwrapped throwable to fail() so AssertionError cause is RecipeRunException

RewriteTest.defaultExecutionContext was passing the outer RecipeError to
fail(), which made the resulting AssertionError's cause RecipeError
instead of the underlying RecipeRunException. This regressed
RepeatTest.repeatValidatesCursorIsPassed, which asserts that the cause
is a RecipeRunException.

Author: steve-aom-elliott

rewrite-test/src/main/java/org/openrewrite/test/RewriteTest.java

@@ -706,9 +706,9 @@ default ExecutionContext defaultExecutionContext(SourceSpec<?>[] sourceSpecs) {
         InMemoryExecutionContext ctx = new InMemoryExecutionContext(t -> {
             Throwable underlying = t instanceof RecipeError ? t.getCause() : t;
             if (underlying instanceof RecipeRunException) {
-                fail("Failed to run recipe at " + ((RecipeRunException) underlying).getCursor(), t);
+                fail("Failed to run recipe at " + ((RecipeRunException) underlying).getCursor(), underlying);
             }
-            fail("Failed to parse sources or run recipe", t);
+            fail("Failed to parse sources or run recipe", underlying);
         });
         for (Consumer<ExecutionContext> customizer : defaultExecutionContextCustomizers.values()) {
             customizer.accept(ctx);