fix: remove broken tests based on jetty-runner (#354)

* tests based on jetty-runner do not work because
  the jetty-runner JAR contains invalid Java SPI services config files
* due to these invalid files Jetty 11.0.20+ is unable to properly
  initialize itself itself
* This change removes all tests based on jetty-runner
  and bumps the Jetty version to 11.0.24
* There are already jobs using the Jetty Maven plugin to
  launch a testing instance + run all tests

pom.parent.xml

@@ -41,7 +41,7 @@
       This artifact is required for:
         1. EmbeddedJettyServer -> scope: test
         2. Tomcat docker image -> scope: compile
-      BUT: Jetty docker image as well as jetty-runner will crash on runtime if
+      BUT: Jetty docker image will crash on runtime if
            this artifact is included because it's already provided so that the
            artifact would apear multiple times on the classpath.
            You can test it via: `mvn jetty:run [-Dapache-jsp.scope=compile]`
@@ -63,7 +63,7 @@
     <!-- main versions -->
     <plantuml.version>1.2025.0</plantuml.version>
     <!-- Please keep the jetty version identical with the docker image -->
-    <jetty.version>11.0.18</jetty.version>
+    <jetty.version>11.0.24</jetty.version>
     <!--
       While changing the version, please update the versions in the following files as well:
       - src/main/webapp/components/app-head.jsp (script import)
@@ -111,7 +111,6 @@
 
     <!-- plugins -->
     <maven-eclipse-plugin.version>2.10</maven-eclipse-plugin.version>
-    <jetty-runner.version>${jetty.version}</jetty-runner.version>
     <jetty-maven-plugin.version>${jetty.version}</jetty-maven-plugin.version>
     <duplicate-finder-maven-plugin.version>1.5.1</duplicate-finder-maven-plugin.version>
     <maven-javadoc-plugin.version>3.5.0</maven-javadoc-plugin.version>
@@ -441,23 +440,6 @@
               </artifactItems>
             </configuration>
           </execution>
-          <!-- provide jetty-runner -->
-          <execution>
-            <phase>package</phase>
-            <goals>
-              <goal>copy</goal>
-            </goals>
-            <configuration>
-              <artifactItems>
-                <artifactItem>
-                  <groupId>org.eclipse.jetty</groupId>
-                  <artifactId>jetty-runner</artifactId>
-                  <version>${jetty-runner.version}</version>
-                  <destFileName>jetty-runner.jar</destFileName>
-                </artifactItem>
-              </artifactItems>
-            </configuration>
-          </execution>
         </executions>
       </plugin>
       <!-- configure eclipse web tools platform (WTP) -->