Revert temporary exclusion of failing Jetty 11 tests

Closes gh-27424

This reverts commit 5eac855.

build.gradle

@@ -299,18 +299,6 @@ configure([rootProject] + javaProjects) { project ->
 	test {
 		useJUnitPlatform()
 		include(["**/*Tests.class", "**/*Test.class"])
-		// TODO Enable excluded tests (https://github.com/spring-projects/spring-framework/issues/27424)
-		filter {
-			excludeTestsMatching("*ErrorHandlerIntegrationTests")
-			excludeTestsMatching("*RequestPartIntegrationTests")
-			excludeTestsMatching("*WebSocketConfigurationTests")
-			excludeTestsMatching("*WebSocketHandshakeTests")
-			excludeTestsMatching("*StompWebSocketIntegrationTests")
-			excludeTestsMatching("*RequestMappingIntegrationTests")
-			excludeTestsMatching("*CrossOriginAnnotationIntegrationTests")
-			excludeTestsMatching("*NestedRouteIntegrationTests")
-			excludeTestsMatching("*WebSocketIntegrationTests")
-		}
 		systemProperty("java.awt.headless", "true")
 		systemProperty("testGroups", project.properties.get("testGroups"))
 		systemProperty("io.netty.leakDetection.level", "paranoid")