updatenotification: update_helper.js recode with pm2 library (v2.27.x)

[bugsounet]

#3285

Because there is so many conflit with package,
I have rewrite the code with v2.27.0-develop

For remember:

• recode: update_helper.js with pm2 library
• fix: default config -> updates is a array
• delete: command-exists library (not used)
• delete: PM2_GetList() function (not used)
• add: check updates.length (prevent crash)
• add: [PM2] tag in log (for better visibility)
• add: pm2 library

advantage:

• we use the pm2 library directly
• avoids weird returns from child_process.exec when requesting a json format from pm2
• simplified the code

inconvenient:

• we have vulnerabilities with axios

240120 Fix:

• use pm2_env.pm_cwd instead of pm2_env.PWD : prevent using pm2 restart <id> --update-env in other directory (for enable GPU rendering for exemple)
• resolve packages (again)

[bugsounet]

Testing and correct some new part of code (new dependency format)

@rejas should i remove the exception of dependency ?

Notes:

• axios vulnerabilities from @pm2/js-api is ignored
• we don't use @pm2/js-api

[rejas]

I actually like the allow-ghsas solution which can stay there as long as the dependabot vulanribility is there.

[bugsounet]

if it's ok for you, it's ok for me ;)