Afform - Add action modes for joins

[colemanw]

Overview

Adds an "Allowed Actions" setting for joined records (e.g. Phone, Email, Multi-value custom) in Afform
Fixes dev/core#5589
Replaces #31477

Before

The main entity supports lets you enable/disable actions, but not the joined entities (email, address, phone, multi-record custom data). Those are currently set to allow create+update+delete.

After

Can disable update & delete actions if desired (if both are unchecked, only create is allowed).

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[devdavc]

@colemanw Thank you so much. I really appreciate you taking your time for this. Everything is great. Thank you again.

[monishdeb]

I have tested this in local m/c and confirmed that the new actions does apply on joined entities. And has a test. Merging now!