Release: use buildDefaultFiles directly and pass version

[timmywil]

• also add the ability to pass VERSION in env to test final builds
• adjust sha regex to account for lack of shas
• set the version on the dist package.json

Summary

Checklist

• [x] New tests have been added to show the fix or feature works
• [x] If needed, a docs issue/PR was created at https://github.com/jquery/api.jquery.com