Add new mental health contact field to VAMC facility

[swirtSJW]

To make sure that we can adequately track the intentional addition of mental health phone number fields. The only way to do this is to have 2 separate fields to compare.

• field_mental_health_phone will be API only modified, blocked from Editor input
• mental_health_contact_phone will be open to Editor input, empty by default, optional (not required)
  • Requested label: Mental health phone number

A companion ticket intends to create a view that lists the content of both fields for comparison.
When the new field has been populated by each VAMC, we will deprecate the original API only field (field_mental_health_phone).

This approach is a reversal of a previous ticket that exposed field_mental_health_phone to Editor mods. #14213

We are going to create a second field that will be available to editors and will be used as a fallback to the field currently populated by lighthouse.

ACs

• Move the existing field field_mental_health_phone back to its place in the api sourced data. Remove its help text and place it on the new field.
• Add new field mental_health_contact_phone to the section just beneath the api sourced data and use the help text from the field_mental_health_phone
• Restore the migration to populate field_mental_health_phone
• Merged to the existing integration branch