Replace test FilterRegistration with the one in testFixtures

See gh-33252

spring-test/src/main/java/org/springframework/mock/web/MockFilterRegistration.java

@@ -38,7 +38,7 @@ import org.springframework.lang.Nullable;
  * @author Rossen Stoyanchev
  * @since 6.2
  */
-public class MockFilterRegistration implements FilterRegistration {
+public class MockFilterRegistration implements FilterRegistration.Dynamic {
 
 	private final String name;
 
@@ -50,6 +50,8 @@ public class MockFilterRegistration implements FilterRegistration {
 
 	private final List<String> urlPatterns = new ArrayList<>();
 
+	private boolean asyncSupported;
+
 
 	public MockFilterRegistration(String className) {
 		this(className, "");
@@ -126,4 +128,13 @@ public class MockFilterRegistration implements FilterRegistration {
 		return Collections.unmodifiableCollection(this.urlPatterns);
 	}
 
+	@Override
+	public void setAsyncSupported(boolean asyncSupported) {
+		this.asyncSupported = asyncSupported;
+	}
+
+	public boolean isAsyncSupported() {
+		return this.asyncSupported;
+	}
+
 }