Provisioning: Allow disabling of image rendering instance wide (#111359)

pkg/tests/apis/openapi_snapshots/provisioning.grafana.app-v0alpha1.json

@@ -4349,9 +4349,15 @@
         "description": "Summary shows a view of the configuration that is sanitized and is OK for logged in users to see",
         "type": "object",
         "required": [
+          "allowImageRendering",
           "items"
         ],
         "properties": {
+          "allowImageRendering": {
+            "description": "Whether image rendering is allowed for dashboard previews",
+            "type": "boolean",
+            "default": false
+          },
           "allowedTargets": {
             "description": "The valid targets (can disable instance or folder types)",
             "type": "array",