Make External Identifiers field's addition optional

I think this is a duplicate of 📌 External Identifier field Active

I missed that issue, but looking at it, it's not clear that it's the same as this. It mentions "Create external crm entity" but is lacking detail. I based this issue off of what's in the 1.0.x branch. Feel free to close one issue if you think it makes sense.

The current External Identifiers field has a "Source" and an "External ID" for each value.

CiviCRM has a single "Contact Source" and a single "External ID". The tooltip for Contact Source is "Use this field to store a description of how/why this contact was added to the database. This field is usually auto-filled when a contact is created from a public form i.e. Event Registration."

That seems to be a different intent than the "Source" defined in CRM's External Identifiers field so I'm double checking what your intent was and whether we should adjust.

Separately, while I see some value in accommodating external IDs for multiple systems, I wonder whether that would better be accommodated using dedicated fields for each system, which could be provided by relevant integration modules. Should we ditch the External Identifiers field in favor of a simple single value External ID field like Civi has?

There is another issue that deal with the external entity field. 📌 External Identifier field Active

There is half completed mork in that issue that I need to bring up to the current dev branch.

In this issue we will remove it as a default field. It will be spun off as it own module in the other issue.

Automatically closed - issue fixed for 2 weeks with no activity.