MedEvac: Common Services user filter + distribution list alongside separate email

[morgang-adappt]

Description

Adds two fields to email notification datasets. csFilter holds a filter descriptor used to select recipients from the Common Services user directory, and individualEmailToDistributionList lets a send-separate dataset also be delivered to the notification's distribution list. Both are plumbed through the Mongoose model, GraphQL input and GraphQL type.

Validation on addEmailNotification / editEmailNotification is rewritten so a send-separate notification can be saved without a distribution list, while still requiring at least one recipient source overall. This replaces the previous check, which incorrectly passed notifications that had no recipients at all.

Useful links

• MedEvac: per-dataset Common Services user filter ems-frontend#2919

Type of change

• New feature (non-breaking change which adds functionality)

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

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Checklist:

( * == Mandatory )

• * I have set myself as assignee of the pull request
• * 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 put the ticket for review, adding the oort-backend team to the list of reviewers
• * 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