Build: Use vite@beta on sandboxes

[yannbf]

Closes #

What I did

Fixed the command that generates a beta vite project for the sandboxes

How to test

Generate and push sandboxes (next) should be green for this PR

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• If this PR should be tested against many or all sandboxes,
  make sure to add the ci:merged or ci:daily GH label to it.
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "documentation", "maintenance", "dependencies", "other"]

[github-actions]

Fails

🚫

A 'patch' label is required to merge during stabilization. Patch PRs are small bug fixes, build updates, and documentation changes. They do not include new features or more disruptive bugfixes. These changes will be first released on 7.1-alpha, then patched back to 'main' after they have been verified to be correct and released as 7.0.x patch releases. After the stabilization period ends (ETA 2023-04-12), the 'patch' label will no longer be required to merge into next, and we will merge ALL accepted PRs to 'next' and release them on 7.1-alpha. Patch PRs will be patched back to 'main' and released in 7.0.x patch releases.

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