chore: fix flakiness report, lint scripts, and fix appsec test (#7396)

This works around a github issue where big pages cause a server error.
The likely issue is that the graphql calls are causing a timeout or similar
issues.

Next to that all scripts are now linted as our regular source code.

On top, a few tests were fixed by updating externals.json and the test code.
These were not detected as having issue due to not using the correct
installed versions.

Author: BridgeAR

.github/workflows/flakiness.yml

@@ -20,11 +20,13 @@ jobs:
           sparse-checkout-cone-mode: false
           sparse-checkout: |
             .github
+            package.json
             scripts
+            yarn.lock
       - uses: ./.github/actions/node
         with:
-          version: ''
-      - run: npm install octokit
+          version: active
+      - run: yarn install --frozen-lockfile --ignore-scripts
       - run: node scripts/flakiness.mjs
       - run: cat flakiness.md >> $GITHUB_STEP_SUMMARY
       - id: slack