Adds constraints.pro rule that removes prepack build scripts

[MajorLift]

Explanation

The prepack build script from incoming migration packages interfere with the release CI and need to be replaced with the prepack script in the root package.json.

This constraints.pro rule enforces that redundant prepack scripts in non-root packages are removed.

References

• See Remove unused prepack scripts #1902
• See https://github.com/MetaMask/core/actions/runs/6629214754/job/18008299892?pr=1897
• Closes Add constraints entry for removing prepack build script from packages #1906

Changelog

N/A

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've highlighted breaking changes using the "BREAKING" category above as appropriate