migration to create global_phase table (attributes: id, name, start date, end date)
front end modal to insert into global phase table
validation: all fields are required, date must be in reasonable range (1900-2099)
we reuse start/end date and validateDateIsReasonable error messages a lot so on FE validation these are now defined as variables (but not replaced in other places where they are used)
did not test that end date actually comes after start date
Ticket: https://freshworks.atlassian.net/browse/HCAP-1277
Included: