Use the new environment_version property (#3554)

## Changes
This updates the DABs serverless example to use the new
environment_version property instead of the deprecated client property.
See https://docs.databricks.com/api/workspace/jobs/create.

## Tests
* Tests were updated, functionality was manually validated

Author: lennartkats-db

NEXT_CHANGELOG.md

@@ -10,4 +10,6 @@
 
 ### Bundles
 
+* Updated templates to use the new "environment_version" property instead of the deprecated "client" property ([#3554](https://github.com/databricks/cli/pull/3554)).
+
 ### API Changes

acceptance/bundle/integration_whl/serverless/databricks.yml.tmpl

@@ -22,6 +22,6 @@ resources:
       environments:
         - environment_key:  "test_env"
           spec:
-            client: "1"
+            environment_version: "2"
             dependencies:
               - ./dist/*.whl

acceptance/bundle/integration_whl/serverless_dynamic_version/databricks.yml.tmpl

@@ -23,6 +23,6 @@ resources:
       environments:
         - environment_key:  "test_env"
           spec:
-            client: "1"
+            environment_version: "2"
             dependencies:
               - ./dist/*.whl

acceptance/bundle/templates/default-python/classic/out.compare-vs-serverless.diff

@@ -41,7 +41,7 @@
 -          # Full documentation of this spec can be found at:
 -          # https://docs.databricks.com/api/workspace/jobs/create#environments-spec
 -          spec:
--            client: "2"
+-            environment_version: "2"
 -            dependencies:
 -              - ../dist/*.whl
 +      job_clusters:

acceptance/bundle/templates/default-python/serverless/output/my_default_python/resources/my_default_python.job.yml

@@ -40,6 +40,6 @@ resources:
           # Full documentation of this spec can be found at:
           # https://docs.databricks.com/api/workspace/jobs/create#environments-spec
           spec:
-            client: "2"
+            environment_version: "2"
             dependencies:
               - ../dist/*.whl

libs/template/templates/default-python/template/{{.project_name}}/resources/{{.project_name}}.job.yml.tmpl

@@ -74,7 +74,7 @@ resources:
           # Full documentation of this spec can be found at:
           # https://docs.databricks.com/api/workspace/jobs/create#environments-spec
           spec:
-            client: "2"
+            environment_version: "2"
             dependencies:
               - ../dist/*.whl
 {{end}}{{ else }}