Introduce ConfigurableApplicationContext.pause() and SmartLifecycle.isPauseable()

Closes gh-35269

spring-test/src/main/java/org/springframework/test/context/cache/ContextCache.java

@@ -93,8 +93,8 @@ public interface ContextCache {
 	/**
 	 * Obtain a cached {@link ApplicationContext} for the given key.
 	 * <p>If the cached application context was previously
-	 * {@linkplain org.springframework.context.Lifecycle#stop() stopped}, it
-	 * must be
+	 * {@linkplain org.springframework.context.ConfigurableApplicationContext#pause() paused},
+	 * it must be
 	 * {@linkplain org.springframework.context.support.AbstractApplicationContext#restart()
 	 * restarted}. This applies to parent contexts as well.
 	 * <p>In addition, the {@linkplain #getHitCount() hit} and
@@ -187,7 +187,7 @@ public interface ContextCache {
 	 * {@link MergedContextConfiguration} and any of its parents.
 	 * <p>If no other test classes are actively using the same application
 	 * context(s), the application context(s) should be
-	 * {@linkplain org.springframework.context.Lifecycle#stop() stopped}.
+	 * {@linkplain org.springframework.context.ConfigurableApplicationContext#pause() paused}.
 	 * <p>The default implementation of this method does nothing. Concrete
 	 * implementations are therefore highly encouraged to override this
 	 * method, {@link #registerContextUsage(MergedContextConfiguration, Class)},

spring-test/src/main/java/org/springframework/test/context/cache/DefaultContextCache.java

@@ -187,7 +187,7 @@ public class DefaultContextCache implements ContextCache {
 		activeTestClasses.remove(testClass);
 		if (activeTestClasses.isEmpty()) {
 			if (context instanceof ConfigurableApplicationContext cac && cac.isRunning()) {
-				cac.stop();
+				cac.pause();
 			}
 			this.contextUsageMap.remove(mergedConfig);
 		}