OORT-239 - Add the possibility to set createdBy.user on excel import

[AntoineRelief]

Description

Add the possibility to set createdBy.user on excel import with a new $user column.
Improve error message for addUsers mutation when email is not correct.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (refactor or addition to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Tested with datasets for Guyane:
https://docs.google.com/spreadsheets/d/1T1jPrATTyBLqSBXQLcN2FuHL1TiOfrto/edit?usp=sharing&ouid=105162548979781419794&rtpof=true&sd=true
https://docs.google.com/spreadsheets/d/1WPtpBQB1hIe3HnyzUWltb7kEwdlAG7Y3/edit?usp=sharing&ouid=105162548979781419794&rtpof=true&sd=true

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have put JSDoc comment in all required places
• I have made corresponding changes to the documentation ( if required )
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have included screenshots describing my changes if relevant

[AntoineRelief]

@matheus-relief
I moved the PR from the older
wasn't there already something done for that?
this one is a bit old