Configure argLine per Mockito documentation

Following Mockito documentation section 0.3, configure surefire/failsafe with @{argLine} late replacement and -XX:+EnableDynamicAgentLoading flag. Added empty argLine property as required by documentation to prevent "VM crash or System.exit called" error when JaCoCo is not active.

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Author: Copilot

pom.xml

@@ -24,8 +24,8 @@
     <lifecycle-mapping.version>1.0.0</lifecycle-mapping.version>
     <jjwt.version>0.13.0</jjwt.version>
     <okhttp.version>5.3.2</okhttp.version>
-    <!-- Enable dynamic agent loading for Mockito/Byte Buddy as recommended by Mockito docs -->
-    <argLine>-XX:+EnableDynamicAgentLoading</argLine>
+    <!-- Default empty argLine property - required for @{argLine} late replacement -->
+    <argLine></argLine>
   </properties>
   <organization>
     <name>Berry Cloud Ltd</name>
@@ -103,9 +103,19 @@
             </dependency>
           </dependencies>
         </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <configuration>
+            <argLine>@{argLine} -XX:+EnableDynamicAgentLoading</argLine>
+          </configuration>
+        </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-failsafe-plugin</artifactId>
+          <configuration>
+            <argLine>@{argLine} -XX:+EnableDynamicAgentLoading</argLine>
+          </configuration>
           <executions>
             <execution>
               <goals>