chore(ci): optimize runner costs (#39214)

.github/workflows/ci-frontend.yml

@@ -15,7 +15,7 @@ jobs:
     # we skip each step individually, so   they are still reported as success
     # because many of them are required for CI checks to be green
     changes:
-        runs-on: depot-ubuntu-24.04-small
+        runs-on: ubuntu-latest
         timeout-minutes: 5
         name: Determine need to run frontend checks
         outputs:
@@ -153,7 +153,7 @@ jobs:
         name: Frontend typechecking
         needs: [changes]
         if: needs.changes.outputs.frontend == 'true'
-        runs-on: depot-ubuntu-24.04-8
+        runs-on: depot-ubuntu-24.04-4
         steps:
             - uses: actions/checkout@v4
 
@@ -248,7 +248,7 @@ jobs:
     calculate-running-time:
         name: Calculate running time
         needs: [jest, frontend-typescript-checks, frontend-format, frontend-toolbar-checks, changes]
-        runs-on: depot-ubuntu-24.04
+        runs-on: ubuntu-latest
         if: # Run on pull requests to PostHog/posthog + on PostHog/posthog outside of PRs - but never on forks
             needs.changes.outputs.frontend == 'true' && (
             (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == 'PostHog/posthog') ||

.github/workflows/ci-nodejs.yml

@@ -23,7 +23,7 @@ jobs:
     # Job to decide if we should run plugin server ci
     # See https://github.com/dorny/paths-filter#conditional-execution for more details
     changes:
-        runs-on: depot-ubuntu-24.04-4
+        runs-on: ubuntu-latest
         timeout-minutes: 5
         name: Determine need to run Node.js checks
         outputs:

playwright/README.md

@@ -33,3 +33,5 @@ Error: locator.click: Error: strict mode violation: locator('text=Set a billing
 1) <span class="LemonButton__content">Set a billing limit</span> aka getByTestId('billing-limit-input-wrapper-product_analytics').getByRole('button', { name: 'Set a billing limit' })
 2) <span class="LemonButton__content">Set a billing limit</span> aka getByTestId('billing-limit-input-wrapper-session_replay').getByRole('button', { name: 'Set a billing limit' })
 ```
+
+<!-- Test 4-core runner performance -->