User should be able to change an explicit join's name from the default

[tlrobinson]

Follow up to #10550, if we get the default join alias wrong (foreign key's display_name with trailing "ID" removed) we should allow the user to change it to something else.

Open questions:

• should we let them edit the join alias or should we add a join display_name?
• should we allow the admin to change the default in the data model?

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