Take a hard dependency on redhat.vscode-yaml extension (#1127)

## Changes
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## Tests
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Author: kartikgupta-db

packages/databricks-vscode/package.json

@@ -768,7 +768,8 @@
     },
     "extensionDependencies": [
         "ms-python.python",
-        "ms-toolsai.jupyter"
+        "ms-toolsai.jupyter",
+        "redhat.vscode-yaml"
     ],
     "vsce": {
         "dependencies": false,