chore(ci): attempt at optimising slow actions

[carderne]

Follow some warpbuild recommendations and see if we can optimise the internal/webapp unit tests.

[changeset-bot]

⚠️ No Changeset found

Latest commit: c9d7f7e

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Walkthrough

GitHub Actions workflows were updated to use larger runners for E2E, typecheck, and Webapp unit tests, and a larger Windows runner for CLI E2E tests. Release and prerelease jobs now document their requirement for GitHub-hosted runners. Internal unit tests now execute 12 parallel local shards in one job with aggregated status and merged reports. Test timing data was regenerated.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is far too brief and omits required template sections like Closes #issue, checklist, testing, changelog, and screenshots.	Add the missing template sections, including the linked issue, checklist items, testing steps, changelog summary, and screenshots or a note that none apply.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title matches the main change: CI workflow optimization for slow unit and E2E actions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch warp-runners

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