chore(e2e): Update dynamic keys suit to run on serial mode

[LauraBeatris]

Description

A previous CI run failed due to errors on app.teardown():

Error: ENOTEMPTY: directory not empty, rmdir '/tmp/.temp_integration/next-app-router17204222846808efe5451ae'

This might be due to racing conditions with app.teardown while building the Next.js app and running tests in parallel mode. I'm updating the mode to serial and will keep monitoring if the same flaky error persists!

Checklist

• [X] npm test runs as expected.
• [X] npm run build runs as expected.
• [ ] (If applicable) JSDoc comments have been added or updated for any package exports
• [ ] (If applicable) Documentation has been updated

Type of change

• [ ] 🐛 Bug fix
• [ ] 🌟 New feature
• [ ] 🔨 Breaking change
• [X] 📖 Refactoring / dependency upgrade / documentation
• [ ] other:

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 4bee26bfe2e03a3a3dd395d76b6a2efe106651ba

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 0 packages

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