fix: do not force musl on linux

[nhedger]

Summary

This PR makes it so the extension no longer looks only for -musl binaries on Linux

• When looking for biome in node_modules: use most appropriate package (@biomejs/cli-linux-x64-musl on systems that use musl, and @biomejs/cli-linux-x64 on the others)
• When downloading Biome from within VS Code: always download the -musl flavor

Description

Some package managers do not automatically install both the @biomejs/cli-linux-x64 and @biomejs/cli-linux-x64-musl, but since our current logic expect the -musl flavor to be installed, some users may have trouble getting the extension to work.

This logic was initially introduced to always download the musl flavor when downloading Biome using the built-in downloader, but we're splitting the logic here so that we look for the most appropriate package in node modules, why still downloading the musl flavor when downloading Biome from VS Code.

This solves the issue because:

1. There are no expectations of compatibility put on the user when downloading Biome from VS Code. Since we use the statically built musl flavor, it just works.
2. We mitigate behavioral differences among the package managers.

Related Issue

Fixes #502

Checklist

• I have tested my changes on the following platforms:
  • Windows
  • Linux
  • macOS