Refactor capital project category from enum to check constraint

[TangoYankee]

Description

The capital project category enum has an extra wrinkle- there is typo. The ITT, Vehicles and Equipment option should have an oxford comma. This ticket will also resolve this typo. The migration will require dropping the columns that hold that data before re-adding it with the updated option. There will be two migrations as part of this ticket

Acceptance criteria

• The capitalProjectCategoryEnum is removed
• The category field is removed from the capitalProject table
• A migration is generated that drops the enum and the column
• The category field is returned but now with a text type
• A check constraint is added to the category field, placing a comma after "Vehicles"
• A second migration is generated

Related

Depends on: #386