cleanup stray scheduler processes

[gwleuverink]

This PR ensures that only one scheduler process runs at a time and that it is properly terminated when needed. The changes add functionality to explicitly kill the scheduler process, preventing potential orphaned processes

Potentially related: NativePHP/laravel#542

[gwleuverink]

After this fix I'm experiencing something else:

This originates from a different place altogether (the tree-kill process termination calls)
It might be this problem was already there but only now becomes apparent now the fix for stray scheduler processes is in place

It's hard to debug though, because it only happens after my Mac wakes up from a particularly long sleep.

Will revert this PR back to draft and do some more digging when it occurs again

[gwleuverink]

After these changes I haven't seen any EBADF errors raised.

The EPIPE error is caused by terminating a composer native:dev process. Which is a different issue we should address separately.

I'll keep a instance running and see if this resolves the issue definitively

[gwleuverink]

I'll keep a instance running and see if this resolves the issue definitively

No more EBADF errors after several days of running the app

[SRWieZ]

Did you close the lid and reopen your Mac ?

If you considering fixed. I would recompile my app with this PR to test it.

[gwleuverink]

Yes with extended sleep overnight. Please do test! 🙏