Partially revert #190 (#238)

Turns out we need a task provider after all, otherwise we see error
messages in the task output panel.

![Screenshot 2022-11-21 at 15 46
56](https://user-images.githubusercontent.com/40952/203084207-b687268d-9bae-4efe-8fa4-c59336f732b7.png)

Author: fjakobs

packages/databricks-vscode/package.json

@@ -59,6 +59,7 @@
         "onCommand:databricks.logs.openFolder",
         "onView:configurationView",
         "onView:clusterView",
+        "onTaskType:databricks",
         "onDebugResolve:databricks",
         "onDebugResolve:databricks-workflow"
     ],
@@ -349,6 +350,11 @@
                 "icon": "$(filter)"
             }
         ],
+        "taskDefinitions": [
+            {
+                "type": "databricks"
+            }
+        ],
         "problemMatchers": [
             {
                 "name": "bricks-sync",