Dev: Add BIT personal background to MS schema

[mtreacy002]

Description

As a BIT Maintainer, I need to add BIT Personal Background table to MS schema, so that I can move further in the BIT-MS full integration process

Acceptance Criteria

Update [Required]

• [ ] Add BIT Personal Background to MS schema
• [ ] Add new migration script version for other contributors to apply the schema changes to their local db

Definition of Done

• [ ] All of the required items are completed.
• [ ] Approval by 1 mentor.

Estimation

1 day