As a developer, I would like to have a dynamic way to add skills for mentors

[esparr]

Currently, the mentor skill list is hardcoded and to update it we much add it to the code directly. We would like to make this process easier.

Acceptance Criteria:

• A Skill model exists
• Skills objects can be associated with a mentor user
• Profile endpoints include skills from new tables
• Session sign up endpoints includes skills from new tables
• All mentors have the same skills as they did before the new skill table
• A script exists to add skills table to each mentor according to what they currently have
• A skills admin user can add skills through admin page, restricted to only Skills adding permissions.
• 100% code coverage for Skills and updated endpoints
• A front end ticket for changes if needed exists.

Considerations:

• We need to make sure that we consider every location we might need to update a skill relationship. Hopefully this covers it but please let us know if you see anything that hasn't been mentioned in the Acceptance Criteria.
• We will need to make sure to coordinate any work that the front end needs to do to implement this change.
• There will need to be verification that current confirmed sessions can still run without issue with this change.