Default to serverless for job deployment in scala job template

contrib/templates/scala-job/library/template_variables.tmpl

@@ -3,7 +3,7 @@
 {{- end }}
 
 {{ define `dbr_version` -}}
-    16.2
+    16.3
 {{- end }}
 
 {{ define `scala_major_minor_version` -}}
@@ -28,4 +28,4 @@
 
 {{ define `jar_path` -}}
     ./target/scala-{{template `scala_major_minor_version` .}}/{{.project_name}}-assembly-{{template `version` .}}.jar
-{{- end }}
+{{- end }}

contrib/templates/scala-job/template/{{.project_name}}/resources/{{.project_name}}.job.yml.tmpl

@@ -6,17 +6,12 @@ resources:
       name: {{.project_name}}
       tasks:
         - task_key: main_task
-          job_cluster_key: {{.project_name}}_job_cluster
           spark_jar_task:
             main_class_name: {{template `main_class_name` .}}
-          libraries:
-            - jar: ../{{template `jar_path` .}}
-      job_clusters:
-        - job_cluster_key: {{.project_name}}_job_cluster
-          new_cluster:
-            spark_version: {{template `dbr_version` .}}.x-scala{{template `scala_major_minor_version` .}}
-            node_type_id: i3.xlarge  # Default instance type (can be changed)
-            autoscale:
-              min_workers: 1
-              max_workers: 4
-            data_security_mode: USER_ISOLATION
+          environment_key: default
+      environments:
+        - environment_key: default
+          spec:
+            client: "3"
+            jar_dependencies:
+                - ${workspace.artifact_path}/.internal/{{.project_name}}-assembly-{{template `version` .}}.jar