Build v2: Fix build failure on Windows

[t-hamano]

What?

This PR fixes the Gutenberg build CI failures occurring in the wordpress-develop repository.

Example of a failed CI: https://github.com/WordPress/wordpress-develop/actions/runs/19058795688/job/54435503272

Why? How?

The getAllPackages() function retrieves all packages using a regular expression pattern. However, on Windows, the path separator is a backslash, and the glob method will not work correctly as is.

This is a common problem, and it can be solved by using normalizePath.

Testing Instructions

On a Windows host OS, check out this branch and run npm run build. The build should succeed.

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Co-authored-by: t-hamano <[email protected]>
Co-authored-by: mukeshpanchal27 <[email protected]>

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[t-hamano]

The cause is clear, and the fix is minor, so I'd like to merge this PR once the CI checks have passed.

[mukeshpanchal27]

✨

[aduth]

I seem to be making a habit of breaking builds on Windows lately 😬 (caused by #72941)

Appreciate you fixing this, and am working in #72946 to try to catch these types of issues more proactively.

[t-hamano]

I'm one of the few Windows developers around, so I'd be happy to help if you need anything 😄

[aduth]

I'm one of the few Windows developers around, so I'd be happy to help if you need anything 😄

Thanks! I may take you up on that offer in #72946, at least for a review. I'm still trying to work through the issues there, but it's a bit of "guess and check" work without having a Windows setup 😅