Feature Request: Support PhpStorm installed from JetBrains Toolbox app

[sc0ttkclark]

What

Currently the PhpStorm app when installed by JetBrains Toolbox does not get set to installed via the logic in https://github.com/Automattic/studio/blob/trunk/src/hooks/use-check-installed-apps.tsx

Why

JetBrains Toolbox does not keep the PhpStorm app in the /Applications/ folder, it's actually stored in the user's directory like for mine that may be something like /Users/sc0ttkclark/Applications/.

How

It may be possible to check for apps in both directories without having to make this JetBrains Toolbox specific.

The logic in https://github.com/Automattic/studio/blob/trunk/src/lib/is-installed.ts could be updated to have the function isInstalled check if the process.platform != 'win32' and in that case it would check if the fs.existsSync( appPaths[ key ] ) OR fs.existsSync( userPathPrefix + appPaths[ key ] ).

Something like that could perhaps be done.