Migrate CI runners from Depot back to GitHub-hosted runners (#18347)

## Summary
- Replaces all `depot-ubuntu-24.04` runners with `ubuntu-latest`
- Replaces all `depot-ubuntu-24.04-8` runners with
`ubuntu-latest-8-cores`
- Updates storybook build cache keys in ci-front.yaml to reflect the
runner name change

Reverts the temporary Depot migration introduced in #18163 / #18179
across all 23 workflow files.

.github/workflows/claude.yml

@@ -23,7 +23,7 @@ jobs:
       (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude') && github.event.comment.user.type != 'Bot') ||
       (github.event_name == 'pull_request_review' && contains(github.event.review.body, '@claude') && github.event.review.user.type != 'Bot') ||
       (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
-    runs-on: depot-ubuntu-24.04
+    runs-on: ubuntu-latest
     timeout-minutes: 60
     permissions:
       contents: write
@@ -96,7 +96,7 @@ jobs:
 
   claude-cross-repo:
     if: github.event_name == 'repository_dispatch'
-    runs-on: depot-ubuntu-24.04
+    runs-on: ubuntu-latest
     timeout-minutes: 60
     permissions:
       contents: write