Revert "Add mockito-core javaagent for future Java compatibility" (jenkinsci#1244)

Causes plugin BOM tests to fail with a JVM crash.  Compatibility with
a future condition is much less important than having tests that run
successfully now.

This reverts commit bfde394.

Author: MarkEWaite

pom.xml

@@ -270,28 +270,13 @@
 
   <build>
     <plugins>
-      <plugin>
-        <!-- Needed by the mockito-core properties reference in surefire -->
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-dependency-plugin</artifactId>
-        <executions>
-          <execution>
-            <goals>
-              <goal>properties</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
           <systemPropertyVariables>
             <org.jenkinsci.plugins.gitclient.verifier.SshHostKeyVerificationStrategy.jgit_known_hosts_file>${project.build.directory}/ssh/know_hosts</org.jenkinsci.plugins.gitclient.verifier.SshHostKeyVerificationStrategy.jgit_known_hosts_file>
           </systemPropertyVariables>
-          <!-- Add mockito javaagent for the MockitoJUnitRunner in Java 21 and beyond -->
-          <!-- https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#0.3 -->
-          <argLine>@{argLine} -javaagent:${org.mockito:mockito-core:jar}</argLine>
         </configuration>
       </plugin>
       <plugin>