src: remove loop_init_failed_ from Worker class

There’s no reason for this to not be stored alongside the loop
data structure itself.

PR-URL: https://github.com/nodejs/node/pull/32562
Refs: https://github.com/nodejs/node/pull/32344


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>