fix: remove ADD opentelemetry-javaagent-extension.jar because it does not exist. (#966)

Author: Msksgm

javaagent/Dockerfile

@@ -2,6 +2,5 @@ FROM eclipse-temurin:25.0.1_8-jre@sha256:f6b092537e68d9836e86f676344e94102f2be32
 
 ADD build/libs/app.jar /app.jar
 ADD build/agent/opentelemetry-javaagent.jar /opentelemetry-javaagent.jar
-ADD build/agent/opentelemetry-javaagent-extension.jar /opentelemetry-javaagent-extension.jar
 
 ENTRYPOINT java -javaagent:/opentelemetry-javaagent.jar -Dotel.javaagent.extensions=/opentelemetry-javaagent-extension.jar -jar /app.jar