add enforcer check to slightly clarify failure if run on Java 11

Situation cant be fully handled as quarkus-maven-plugin must target Java 11 for now
even though Quarkus requires Java 17, as only Maven 3.9.6+ can actually handle
plugins targeted to Java 17.

See quarkusio/quarkus#39358 and https://issues.apache.org/jira/browse/MNG-7913

pom.xml

@@ -15,6 +15,7 @@
     <quarkus.platform.version>3.8.2</quarkus.platform.version>
     <skipITs>true</skipITs>
     <surefire-plugin.version>3.0.0-M7</surefire-plugin.version>
+    <maven-enforcer-plugin-version>3.4.1</maven-enforcer-plugin-version>
     <artemis-version>2.31.2</artemis-version>
 
     <!-- Helper properties for CI etc testing, allows using the extensions original bom rather than its one from io.quarkus.platform, useful when using Quarkus core directly instead. E.g:
@@ -131,6 +132,27 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <version>${maven-enforcer-plugin-version}</version>
+        <executions>
+          <execution>
+            <id>enforce-java-version</id>
+            <goals>
+              <goal>enforce</goal>
+            </goals>
+            <configuration>
+              <rules>
+                <requireJavaVersion>
+                  <version>[${maven.compiler.release},)</version>
+                  <message>Java ${maven.compiler.release} or newer is required to use the quickstart.</message>
+                </requireJavaVersion>
+              </rules>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>
   <profiles>