[FIX] server: do not restart if phoenix is True (#21209)

Before this commit, saving a file being watched by watchdog
(--dev=reload) with vim (and possibly other text editors) would
crash the server via a KeyboardInterrupt error.

This happens because vim, emacs cause multiple filesystem events to
happen when saving a single file, the FSWatcher registers these events
as multiple SIGHUPs which in turn calls restart() multiple times in a
very small amount of time which makes the KeyboardInterrupts completely
shut down the server

This is fixed by only calling restart() if odoo.phoenix is False, since
catching a SIGHUP sets it to true.

Fixes #21178

Special thanks to @odony for the help :)

odoo/service/server.py

@@ -140,8 +140,9 @@ class FSWatcher(object):
                     except SyntaxError:
                         _logger.error('autoreload: python code change detected, SyntaxError in %s', path)
                     else:
-                        _logger.info('autoreload: python code updated, autoreload activated')
-                        restart()
+                        if not getattr(odoo, 'phoenix', False):
+                            _logger.info('autoreload: python code updated, autoreload activated')
+                            restart()
 
     def start(self):
         self.observer.start()