Add linter for scenario files

This adds a linter for JSON scenario files which will validate the JSON
files in the scenarios directory against the TypeScript types. It will
convert the TypeScript types to JSON schema to simplify this process.

Unfortunately, this will not currently allow adding scenarios with
failing requests since the types do not allow this. Rather than removing
this validation, we should fix the types. This can be done in a follow-up
PR.

Author: koesie10

.github/workflows/main.yml

@@ -103,6 +103,11 @@ jobs:
         run: |
           npm run lint
 
+      - name: Lint scenarios
+        working-directory: extensions/ql-vscode
+        run: |
+          npm run lint:scenarios
+
       - name: Run unit tests (Linux)
         working-directory: extensions/ql-vscode
         if: matrix.os == 'ubuntu-latest'