Fix linux beefbuild indefinite hang on some environments.

[mdsitton]

I noticed that beefbuild when installed into a system location that is inaccessible to writes runs into a permission issue with builds since the previous behavior was to create the BeefManaged folder relative to the bin/ location instead of the location the ide currently does which is in ~/.config/beeflang/BeefManaged

So with that said this PR makes the following changes:
Initialize the packaged Linux user data directory the same way for BeefIDE and BeefBuild so that they both store managed libraries under the user's config directory instead of the installation directory.

I've also made some additional changes to surface errors like this quicker in the future instead of having silently failing build command that seems to never exit.

As such now if there is any similar permissions issues in the future it will output something like this and exit instead of the hang:

$ beefbuild
ERROR: Failed to create managed library directory '/opt/BeefLang/bin/BeefManaged'
ERROR: Failed to initialize managed library support for project 'SDL3-Beef.git'