new trigger for notifications (new user/ change in a form)

[AntoineRelief]

Description

OORT - New trigger for notification (new user/ change in a form)

Type of change

• Improvement (refactor or addition to existing functionality)

Original PR: ReliefApplications#686

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

• Test A
• Test B

Screenshots

Please include screenshots of this change. If this issue is only back-end related, and does not involve any visual change of the platform, you can skip this part.

Checklist:

( * == Mandatory )

• * The pull request is linked to an existing milestone
• * My code follows the style guidelines of this project
• * Linting does not generate new warnings
• * 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
• * My changes generate no new warnings
• * I have included screenshots describing my changes if relevant
• * I have selected labels in the Pull Request, according to the changes with code brings
• I have made corresponding changes to the documentation ( if required )
• 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