Change Add User ID column down definition

*Migration was not reversable
*Migration was created to convert a mistakenly created column data type.
Initially accidentally set up as a string, but the migration changed it
to integer.
*This migration creates an empty down definition only because user id
column should remain an integer date type.
Add link to assign a new customer to a performance

*Based on their role, ex: COR, or Supervisor
*Role is carried in the params
*Re-organzize performance-contacts on performance show
Display different hyperlink depending on existence of contact

*Link to Add contact appears if there is a null contact object
*Link to Edit contact appears if there is an existing contact with that
role present
Link to customer contact from contacts index