junit4->5: rewrite @Rule Timeout to @Timeout

[vlsi]

Describe the solution you'd like

JUnit 4:

import org.junit.rules.Timeout;

  @Rule
  public Timeout timeout = new Timeout(30, TimeUnit.SECONDS);

JUnit 5:

import org.junit.jupiter.api.Timeout;

  @Timeout(value = 30)

[timtebeek]

Good suggestion; we already have handling for timeouts when the timeout is specified on the @Test annotation, as seen in

rewrite-testing-frameworks/src/test/java/org/openrewrite/java/testing/junit5/UpdateTestAnnotationTest.java

Lines 274 to 303 in 99d1529

	@Test
	void annotationWithTimeout() {
	//language=java
	rewriteRun(
	java(
	"""
	import org.junit.Test;
	public class MyTest {
	@Test(timeout = 500)
	public void test() {
	}
	}
	""",
	"""
	import org.junit.jupiter.api.Test;
	import org.junit.jupiter.api.Timeout;
	public class MyTest {
	@Test
	@Timeout(500)
	public void test() {
	}
	}
	"""
	)
	);
	}

We indeed lack support when a Timeout Rule is used; that can be added similar to some of the other @Rules we already handle, like ExpectedExceptionToAssertThrows.