Add text validation to appointment custom text in Service Location

[omahane]

User Story or Problem Statement

As an editor, I would like to have validation on the Custom text field of the Appointment information in the Service Location so that I can ensure that I have filled out that field before I save the page.

Context

Prior to the Service Location being the source of truth for Appointment text type and custom text, the VAMC Facility Health Service had these fields and validated the presence of text in the Custom text field if "Custom text" was chosen for the Appointment text type.

Implementation steps

The likely area to add this code would be va_gov_facilities_field_widget_single_element_paragraphs_form_alter in va_gov_facilities.module.

Some code is captured in this branch: VACMS-17124-add-text-validation-custom-appt-text-serv-loc

Screenshots

Acceptance Criteria

• When saving a service of any of the 4 applicable content types, should the Appointment introduction text field be set to "Customize text" and Custom text textbox should show as required.
• Appropriate error messages are displayed in error scenatrios
• Should the Customize text be selected and the Custom text be empty, the node should not save.
• Should Javascript be disabled, server-side validation should prevent the node from being saved.
• The above should be true for the following content types:
  • Service Region
  • VAMC Facility Health Service
  • VAMC Facility Non-Clinical Service
  • VBA Facility Service
• Requires design review
• Requires accessibility review

[davidmpickett]

Unlikely that this will get pulled in to Sprint 2 given that this is hefty and there's a good chunk of higher priority tickets on the docket, but will leave it here until Sprint Planning next week for official call