use large runner for flaky test detection

Author: mydea

.github/workflows/build.yml

@@ -381,7 +381,7 @@ jobs:
     name: Browser Unit Tests
     needs: [job_get_metadata, job_build]
     timeout-minutes: 10
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Check out current commit (${{ needs.job_get_metadata.outputs.commit_label }})
         uses: actions/checkout@v4

.github/workflows/flaky-test-detector.yml

@@ -23,7 +23,7 @@ concurrency:
 
 jobs:
   flaky-detector:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-20.04-large-js
     timeout-minutes: 60
     name: 'Check tests for flakiness'
     # Also skip if PR is from master -> develop