Allow SMTP configuration without auth

[xavier-calland]

• do not check for user/pass in isEmailSetUp
• do not pass an "auth" property to nodemailer if no user/pass

Issue: #3740

[CLAassistant]

All committers have signed the CLA.

[nathanael-h]

Hello, on my server there is an SMTP which does not requiere auth when reached internally (via localhost or 127.0.0.1). I think this PR could fix the issue I have (https://github.com/YunoHost-Apps/n8n_ynh/issues/30). If I try to build and test this PR, would this help?

[github-actions[bot]]

Great PR! Please pay attention to the following items before merging:

Files matching packages/**:

• [ ] If fixing bug, added test to cover scenario.
• [ ] If addressing forum or Github issue, added link to description.

Files matching packages/**/*.ts:

• [ ] Added unit tests to cover new or updated functionality.

Make sure to check off this list before asking for review.

[codecov[bot]]

Codecov Report

Patch coverage: 20.00% and project coverage change: +0.01% :tada:

Comparison is base (a82107f) 24.85% compared to head (0f38e40) 24.86%. Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3742      +/-   ##
==========================================
+ Coverage   24.85%   24.86%   +0.01%     
==========================================
  Files        3144     3144              
  Lines      191241   191258      +17     
  Branches    21089    21095       +6     
==========================================
+ Hits        47528    47552      +24     
+ Misses     142735   142725      -10     
- Partials      978      981       +3     

Files Changed	Coverage Δ
...ackages/cli/src/UserManagement/email/NodeMailer.ts	11.11% <0.00%> (-1.02%)	:arrow_down:
...ges/cli/src/UserManagement/UserManagementHelper.ts	78.88% <100.00%> (-0.46%)	:arrow_down:

... and 8 files with indirect coverage changes

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[Joffcom]

Hey @xavier-calland,

Thanks for the PR and sorry for the delay, I am planning on getting this merged shortly.

[janober]

Got released with [email protected]