fix: allow custom lazyCompilation.backend.client

[colinaaa]

Summary

There is an option experiments.lazyCompilation.backend.client that can specify custom client of LazyCompilation.

But it doesn't seem to work since it will always be overwritten by hot/lazy-compilation-web.js or hot/lazy-compilation-node.js

Checklist

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

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[codspeed-hq]

CodSpeed Performance Report

Merging #8934 will not alter performance

_{Comparing colinaaa:main (1276e25) with main (99f77c8)}

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Summary

✅ 3 untouched benchmarks

[JSerFeng]

Thank u !