fix: javax servlet required by spring weblux tests

Author: bric3

dd-java-agent/instrumentation/spring/spring-webflux/spring-webflux-5.0/build.gradle

@@ -85,6 +85,7 @@ dependencies {
   testImplementation project(':dd-java-agent:instrumentation:reactor-core-3.1')
   testImplementation project(':dd-java-agent:instrumentation:reactive-streams')
   testImplementation project(':dd-java-agent:instrumentation:reactor-netty-1')
+  testImplementation group: 'javax.servlet', name: 'javax.servlet-api', version: '3.1.0'
 
   testImplementation group: 'org.springframework', name: 'spring-webflux', version: '5.0.0.RELEASE'
   testImplementation group: 'io.projectreactor.ipc', name: 'reactor-netty', version: '0.7.0.RELEASE'

dd-java-agent/testing/build.gradle

@@ -38,8 +38,8 @@ dependencies {
   api libs.bundles.test.logging
   api libs.guava
 
-  // Jetty is bundled (relocated) in the shadow jar, not exposed as transitive dependency
-  // This avoids version conflicts with instrumentation tests that use different jetty versions
+  // Do not expose jetty as a transitive dependency, as it conflicts
+  // with versions used to test instrumentions
   compileOnly group: 'org.eclipse.jetty', name: 'jetty-server', version: '9.4.56.v20240826'
   runtimeOnly group: 'org.eclipse.jetty', name: 'jetty-server', version: '9.4.56.v20240826'
   // ^ 9.4 last to support java 8