Allow running integration tests easily locally

[jpwilliams]

Summary

Adds the pnpm run itest script to allow easily running integration tests locally as opposed to only on GitHub Actions.

Checklist

• [ ] Added a docs PR that references this PR N/A
• [x] Added unit/integration tests
• [x] Added changesets if applicable

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 8ed0174e86a5764f4322eaf124cd8a3d1b842fcf

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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