Update benchmark workflow to specify external data path and store results in a dedicated directory

Author: TheAngryByrd

.github/workflows/benchmark.yml

@@ -61,8 +61,8 @@ jobs:
           output-file-path: 'BenchmarkDotNet.Artifacts/results/IcedTasks-Combined-Benchmarks.json'
           github-token: ${{ secrets.GITHUB_TOKEN }}
           auto-push: false
-          # Don't try to fetch gh-pages since we're not using it
-          skip-fetch-gh-pages: true
+          # This is the key parameter - tells the action where to write results instead of using gh-pages
+          external-data-json-path: 'benchmark-data/data.json'
           # Store data in a different location that we'll use for Pages deployment
           benchmark-data-dir-path: 'benchmark-data'
           # Show alert with commit comment on detecting possible performance regression