Don't run gulp for integration tests

We previously attempted to speed up no-workspace tests [1] but realised
we still needed to run some setup steps to get the latest files [2].

Given that we already have `npm run watch` running in the background
when we run our tests, we should be able to regenerate files on the fly.

This means we can drop `gulp` from our setup steps when running integration
tests.

While there's still a danger that you forget to run `npm run watch` in
the background, we think the massive speed up (10s -> 1s) is worth it
as we add more and more tests to this extension.

[1]: #1694
[2]: #1696

Author: elenatanasoiu

extensions/ql-vscode/package.json

@@ -1256,7 +1256,7 @@
     "test": "npm-run-all -p test:*",
     "test:unit": "mocha --config .mocharc.json test/pure-tests/**/*.ts",
     "test:view": "jest",
-    "integration-setup": "rm -rf ./out/vscode-tests && gulp",
+    "integration-setup": "rm -rf ./out/vscode-tests",
     "integration": "npm run integration-setup && node ./out/vscode-tests/run-integration-tests.js no-workspace,minimal-workspace",
     "integration:no-workspace": "npm run integration-setup && node ./out/vscode-tests/run-integration-tests.js no-workspace",
     "integration:minimal-workspace": "npm run integration-setup && node ./out/vscode-tests/run-integration-tests.js minimal-workspace",