Update workflow to v5.0.0-beta.24

[marcopiraccini]

Bumps workflow to 5.0.0-beta.24 in e2e-v5/. Three substantive changes are needed to keep all e2e suites green.

Changes

packages/workflow/plugins/events.ts — lazy step_started branch. Beta.21+ defers step_created on the inline path and expects the world to atomically create the step row from step_started (carrying eventData.input). We do INSERT ... ON CONFLICT DO NOTHING RETURNING id; race losers get 409 -> EntityConflictError -> { type: 'skipped' }.

e2e-v5/workflows/{e2e,serde-steps}.ts — drop .js extension from 3 step-file imports. Upstream regression in @workflow/builders fast-discovery (still present in beta.24): it doesn't rewrite .js -> .ts for relative imports, so .js-suffixed step imports get silently dropped from the manifest. No-extension imports use the candidate loop and work. Minor deviation from upstream Vercel sources; comment in each file documents it.

eslint.config.js — ignore e2e-v{4,5}/next-env.d.ts. Next 16 auto-rewrites these files with double quotes + semicolons, violating project style. The files are annotated as not-to-be-hand-edited.

Plus Next 16 / workflow rebuild regenerations: tsconfig.json, next-env.d.ts, e2e-v4/public/.well-known/workflow/v1/manifest.json, and a new e2e-v5/.gitignore for /.swc.

Follow-up

File upstream at vercel/workflow for the fast-discovery .js -> .ts regression; revert the import edits when fixed.