feat(artifacts-helper): add fish shell support for aliases

[ansemb]

Summary

This PR adds fish shell support for the artifacts helper shims/aliases.

Changes

• Creates fish function files in ~/.config/fish/functions/ for each enabled alias
• Supports all existing aliases: dotnet, nuget, npm, yarn, npx, rush, rush-pnpm, pnpm, pnpx
• Respects existing sudo logic for non-root vs root installations

How it works

For each alias, a fish function file is created (e.g., dotnet.fish):

function dotnet --wraps=/usr/local/share/codespace-shims/dotnet
    /usr/local/share/codespace-shims/dotnet $argv
end

[markphip]

With the current version moving to shims, what is the need for aliases? The aliases still present were only left in tact to support a specific backwards compatibility scenario. Why would new aliases be needed?

[ansemb]

With the current version moving to shims, what is the need for aliases? The aliases still present were only left in tact to support a specific backwards compatibility scenario. Why would new aliases be needed?

Ahh, yes good point. I didn't realise this recent change, so this isn't needed. Thanks!