Replace dashboard and volume defaults tests with acceptance tests (#2733)

## Changes

- Replace configure_dashboard_defaults_test.go with acceptance test
- Replace configure_volume_defaults_test.go with acceptance test

## Why
Going to refactor default machinery:
#2734

Author: denik

acceptance/bundle/validate/dashboard_defaults/databricks.yml

@@ -0,0 +1,24 @@
+bundle:
+  name: BUNDLE
+
+workspace:
+  resource_path: /foo/bar
+
+resources:
+  dashboards:
+    empty_string:
+      # unchanged
+      parent_path: ""
+
+    non_empty_string:
+      # unchanged
+      parent_path: "already-set"
+
+    other_fields:
+      display_name: hello
+      # parent_path set default
+
+    set_to_true:
+      embed_credentials: true
+
+    completely_empty: {}

acceptance/bundle/validate/dashboard_defaults/output.txt

@@ -0,0 +1,28 @@
+{
+  "completely_empty": {
+    "embed_credentials": false,
+    "parent_path": "/Workspace/foo/bar",
+    "permissions": []
+  },
+  "empty_string": {
+    "embed_credentials": false,
+    "parent_path": "",
+    "permissions": []
+  },
+  "non_empty_string": {
+    "embed_credentials": false,
+    "parent_path": "already-set",
+    "permissions": []
+  },
+  "other_fields": {
+    "display_name": "hello",
+    "embed_credentials": false,
+    "parent_path": "/Workspace/foo/bar",
+    "permissions": []
+  },
+  "set_to_true": {
+    "embed_credentials": true,
+    "parent_path": "/Workspace/foo/bar",
+    "permissions": []
+  }
+}

acceptance/bundle/validate/dashboard_defaults/script

@@ -0,0 +1 @@
+$CLI bundle validate -o json | jq .resources.dashboards

acceptance/bundle/validate/volume_defaults/databricks.yml

@@ -0,0 +1,13 @@
+bundle:
+  name: BUNDLE
+
+resources:
+  volumes:
+    v1:
+      volume_type: ""
+
+    v2:
+      volume_type: "already-set"
+
+    v3:
+      comment: hello

acceptance/bundle/validate/volume_defaults/output.txt

@@ -0,0 +1,12 @@
+{
+  "v1": {
+    "volume_type": ""
+  },
+  "v2": {
+    "volume_type": "already-set"
+  },
+  "v3": {
+    "comment": "hello",
+    "volume_type": "MANAGED"
+  }
+}

acceptance/bundle/validate/volume_defaults/script

@@ -0,0 +1 @@
+$CLI bundle validate -o json | jq .resources.volumes