Add .cjs (common JS) as a viable extension

[Timic3]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	n/a
Fixed tickets	#4652
License	MIT
Doc PR	https://github.com/pm2-hive/pm2-hive.github.io/pulls

This pull request fixes the following problem: If you define type: module inside package.json, none of the extensions on config file would work (tried with mjs and js). This happens on pm2 deploy command.

This is merely a temporary solution; it would be nice to support module exports, but due to require being used here, we can't. I believe this happens only on pm2 deploy command.

[CLAassistant]

All committers have signed the CLA.

[koistya]

pm2 deploy production doesn't seem to be able find ecosystem.config.cjs in an ESM project.