Support ContextLoader config in @⁠SpringJUnit[Web]Config

Prior to this commit, @⁠SpringJUnitConfig and @⁠SpringJUnitWebConfig
did not declare `loader` attributes that alias @⁠ContextConfiguration's
`loader` attribute. Consequently, it was not possible to configure a
custom ContextLoader via those annotations.

The lack of those `loader` attributes was an oversight, and this commit
introduces them to support custom ContextLoader configuration directly
via the @⁠SpringJUnitConfig and @⁠SpringJUnitWebConfig annotations.

Closes gh-31498

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,6 +27,7 @@ import org.springframework.context.ApplicationContext;
 import org.springframework.test.context.junit.jupiter.comics.Cat;
 import org.springframework.test.context.junit.jupiter.comics.Dog;
 import org.springframework.test.context.junit.jupiter.comics.Person;
+import org.springframework.test.context.support.AnnotationConfigContextLoader;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -40,7 +41,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @see SpringExtension
  * @see ParameterizedTest
  */
-@SpringJUnitConfig(TestConfig.class)
+@SpringJUnitConfig(classes = TestConfig.class, loader = AnnotationConfigContextLoader.class)
 class SpringExtensionParameterizedTests {
 
 	@ParameterizedTest

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@ import org.junit.jupiter.api.Test;
 
 import org.springframework.http.MediaType;
 import org.springframework.test.context.junit.jupiter.SpringExtension;
+import org.springframework.test.context.web.AnnotationConfigWebContextLoader;
 import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.web.context.WebApplicationContext;
 
@@ -49,7 +50,7 @@ import static org.springframework.test.web.servlet.setup.MockMvcBuilders.webAppC
  * @see org.springframework.test.context.junit.jupiter.SpringExtensionTests
  * @see org.springframework.test.context.junit.jupiter.ComposedSpringExtensionTests
  */
-@SpringJUnitWebConfig(WebConfig.class)
+@SpringJUnitWebConfig(classes = WebConfig.class, loader = AnnotationConfigWebContextLoader.class)
 @DisplayName("Web SpringExtension Tests")
 class WebSpringExtensionTests {