fix: 🐛 align get provided exports with webpack

[stormslowly]

Summary

close #9016
the issue is caused by rspack's dll's manifest file contains an extract exports: [] in delegated modules's description.
the root of exports: [] is that rspack always return vec in get provided exports function.

solution

align the implementation with webpack

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[codspeed-hq]

CodSpeed Performance Report

Merging #9050 will not alter performance

_{Comparing fix/align_provide_exports (6fe73a5) with main (c06787b)}

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Summary

✅ 3 untouched benchmarks

[stormslowly]

related case snapshot updated；cjs‘s exports which were marked as empty within previous implementation are change to null (as determined in runtime)

[ahabhgk]

I don't think this is an appropriate fix. I'm more inclined to think that there's a mistake in webpack. According to the logic here, our original way of writing was correct.

[ahabhgk]

Ok, our original way of writing is also wrong, should be if info.redirect_to.is_none()