Use pre-built jar and v2 tag to bypass Gradle permission issue

- Call java -jar synthea-with-dependencies.jar directly instead of
  run_synthea which invokes Gradle at runtime
- Tag image as v2 to force K8s to pull fresh image

nextflow.config

@@ -26,7 +26,7 @@ profiles {
     k8s {
         process {
             executor = 'k8s'
-            container = 'harbor.cluster.omic.ai/omic/synthea-alldiseases:latest'
+            container = 'harbor.cluster.omic.ai/omic/synthea-alldiseases:v2'
         }
         docker {
             enabled = true