[6.x] Filter out invalid vue export keys

[jasonvarga]

When attempting to compile an addon's js, it would fail on certain keys like module.exports.

error during build:
vue-external (4:1284): Expected ',', got '.' (Note that you need plugins to import files that are not JavaScript)
file: vue-external:4:1284

Object.keys(Vue) contained module.exports for the user who reported this issue. They are using Node 24. I'm using Node 22 and it doesn't contain module.exports. I don't have Node 24 to confirm that is exactly the issue, but this regex addition will filter out invalid keys regardless.