Scan PATH environment variable for java on non-windows OS

[TymanWasTaken]

Original reporter/ticket ID

No response

Project

Core

Describe the bug

OneLauncher checks the Path on Windows, but not on MacOS or Linux, meaning if a distro installs java in a location not expected by OneLauncher, but adds it to the PATH so it can still be found, OneLauncher won't be able to find it.

Steps to reproduce

1. Install java in an unexpected location and add it to your PATH
2. Attempt to start minecraft
3. OneLauncher attempts to download java at runtime instead of use the existing one

Expected behavior

OneLauncher uses the system installed java version

Operating System information

NixOS Unstable, tested with jre8 and jre{17,18}_minimal packages

Additional context

No response