Fail build for JUnit discovery issues

JUnit 5.13 introduced support for Discovery Issues which typically
indicate configuration errors in tests that may result in unexpected
behavior.

Furthermore, discovery issues that are currently reported at INFO level
may later be reported at WARNING or ERROR level -- for example, in
JUnit 6.

In order to ensure that our test suite does not suffer from such
potential errors, this commit sets the
junit.platform.discovery.issue.severity.critical JVM system property to
INFO (instead of leaving it with the default ERROR configuration).

Doing so aligns with our build configuration which fails the build for
selected warnings in Java source code and Javadoc.

If we later determine that INFO causes unnecessary issues for us, we
can switch to WARNING.

This commit also removes two "intentionally invalid" test cases from
AutowiredConfigurationErrorsIntegrationTests, since those test cases
are now reported as invalid as of JUnit 5.13.

Closes gh-35107

buildSrc/src/main/java/org/springframework/build/TestConventions.java

@@ -62,7 +62,8 @@ class TestConventions {
 		test.include("**/*Tests.class", "**/*Test.class");
 		test.setSystemProperties(Map.of(
 				"java.awt.headless", "true",
-				"io.netty.leakDetection.level", "paranoid"
+				"io.netty.leakDetection.level", "paranoid",
+				"junit.platform.discovery.issue.severity.critical", "INFO"
 		));
 		if (project.hasProperty("testGroups")) {
 			test.systemProperty("testGroups", project.getProperties().get("testGroups"));

spring-test/src/test/java/org/springframework/test/context/junit/jupiter/AutowiredConfigurationErrorsIntegrationTests.java

@@ -65,11 +65,9 @@ class AutowiredConfigurationErrorsIntegrationTests {
 	@ParameterizedTest
 	@ValueSource(classes = {
 		StaticAutowiredBeforeAllMethod.class,
-		StaticAutowiredPrivateBeforeAllMethod.class,
 		StaticAutowiredAfterAllMethod.class,
 		AutowiredBeforeEachMethod.class,
 		AutowiredAfterEachMethod.class,
-		AutowiredPrivateAfterEachMethod.class,
 		AutowiredTestMethod.class,
 		AutowiredRepeatedTestMethod.class,
 		AutowiredParameterizedTestMethod.class
@@ -168,21 +166,6 @@ class AutowiredConfigurationErrorsIntegrationTests {
 		}
 	}
 
-	@SpringJUnitConfig(Config.class)
-	@FailingTestCase
-	static class StaticAutowiredPrivateBeforeAllMethod {
-
-		@Autowired
-		@BeforeAll
-		private static void beforeAll(TestInfo testInfo) {
-		}
-
-		@Test
-		@DisplayName(DISPLAY_NAME)
-		void test() {
-		}
-	}
-
 	@SpringJUnitConfig(Config.class)
 	@TestInstance(PER_CLASS)
 	@FailingTestCase
@@ -260,22 +243,6 @@ class AutowiredConfigurationErrorsIntegrationTests {
 		}
 	}
 
-	@SpringJUnitConfig(Config.class)
-	@FailingTestCase
-	static class AutowiredPrivateAfterEachMethod {
-
-		@Test
-		@DisplayName(DISPLAY_NAME)
-		void test() {
-		}
-
-		@Autowired
-		@AfterEach
-		private void afterEach(TestInfo testInfo) {
-		}
-	}
-
-
 	@SpringJUnitConfig(Config.class)
 	@FailingTestCase
 	static class AutowiredTestMethod {