Make changes to Django model and API to reflect new "disabled" state

[henrywrightPSC]

What?
As a system administrator I want to move all of one care providers' care recipients into a state where messages aren't sent for them but their information remains in the system.

Why?

• A care provider may want to turn off messages for a week
• We may need to pause the pilot for some reason and this would add robustness

It's done when

• Django model changes are made to add a new boolean is_disabled field with a default value of false
• Changes made to the OpenAPI spec on the infrastructure repo to document the following behaviour of the /care-provider-location/_search API endpoint
  • 404 not found for a request made for a care recipient marked as is_disabled=true in the database (this will be identical to if a patient isn't in the database at all
• A 404 not found is returned for requests made where the care recipient is in the database but marked as is_disabled=true
• Remaining functionality continues to work as-is for those marked as is_disabled=false