feat: allow multiple ext for bundlers config file

[Julien-R44]

Proposed changes

detectAssetBundlers doesn't detect vite if we are using vite.config.ts instead of vite.config.js for exemple

Same with webpack.config. Particularly annoying because we have to use webpack.config.cjs for V6 and ESM

[Julien-R44]

Also included a fix for the encore buildCommand.
It has to be encore production otherwise we get this output :

Sorry I was a bit lazy to make another PR for this 😅 But let me know if needed

[Julien-R44]

Somes tests seem flaky on Windows. I have the same behavior locally. I'm getting some EBUSY errors. I'll try to find out why

[thetutlage]

Somes tests seem flaky on Windows. I have the same behavior locally. I'm getting some EBUSY errors. I'll try to find out why

Yeah, it is a very well known issue with Windows file system on CI/CD. I haven't found any way around yet.