New Case Contact Table: implement "add new case" button

[MikeRose151]

What type(s) of user does this feature affect?

• volunteers

Description

This ticket is a sub-section of a bigger ticket: #6462.
Some foundational work for the bigger ticket has been started in this PR: #6467.

This ticket is to add the "add new case" button and its functionality to actually add a new case (and therefore a new row in the table). The existing version of the case contacts table (old design) includes the logic for this action, so it should be a case of refactoring so that it works on this new design.

Screenshots of current behavior, if any

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[MikeRose151]

Please may I get assigned to work on this ticket? I don't think I have permissions to assign myself

[github-actions]

This issue has been open without changes for a long time! What's up?

[cliftonmcintosh]

Unless @MikeRose151 is planning to pick this back up, I am happy to take it.

[compwron]

go for it :)