Summary

• Add status handling to functions_evloop and update plugins for proper exit status tracking
  • Thread should not call exit directly, if the main process (e.g app_plugin) holds a mutex the auto cleanup (destructor) will cause the plugin to crash (note: it doesn't affect the main netdata process)

Summary by cubic

Propagates exit codes from functions_evloop to plugin mains. Fixes shutdown by avoiding exit() in worker threads to prevent crashes when a mutex is held.

• Bug Fixes
  • Reader thread now stores the status (if provided) and sets plugin_should_exit using atomics; it no longer calls exit().
  • Updated plugins: apps.plugin tracks exit_status, checks the exit flag atomically, and exits with the recorded status; ebpf, freeipmi, windows-events, systemd-journal, systemd-units, and network-viewer use the new functions_evloop_init signature (status is optional) and now check plugin exit atomically to avoid race conditions.

^{Written for commit 11cfd84. Summary will update automatically on new commits.}