fix(dev): Use correct schema for GHA workflow files in VSCode (#4727)

VSCode has a feature[1] wherein it auto-detects what schema to use to validate certain JSON and yml files. The problem is, sometimes it's wrong[2], and when it is, it will throw errors* because it's misconstrued what kind of file you're editing. The incorrect association can be overridden, though, with a correct association in settings.

This adds such an association, to prevent VSCode from complaining about our GHA `build` workflow.

*It correctly detects that it's a GHA config, but also checks it against the schema for a different build tool[3] called `hammerkit`, and throws errors because the two schemas are incompatible

[1] https://code.visualstudio.com/docs/languages/json#_json-schemas-and-settings
[2] microsoft/vscode#74943 (comment)
[3] https://no0dles.gitbook.io/hammerkit/

Author: lobsterkatie

.vscode/settings.json

@@ -17,5 +17,8 @@
     "editor.formatOnType": false,
     "editor.formatOnPaste": false,
     "editor.formatOnSave": false
-  }
+  },
+  "yaml.schemas": {
+    "https://json.schemastore.org/github-workflow.json": ".github/workflows/**.yml"
+  },
 }