Mentorship-backend: Fix: refactor HTTP error codes POST /mentorship_relation/{request_id}/task

[mtreacy002]

Description

As a GSoC student,
I need the correct HTTP error response code to be returned accordingly by Mentorship System API in relation to POST /mentorship_relation/{request_id}/task,
so that I can represent the error message accordingly to both Mentorship System and Bridge In Tech users.

Mocks

NA

Acceptance Criteria

Update [Required]

• [ ] 201: Created needs to be returned instead of 200:OK if the process is successful
• [ ] 403: Forbidden needs to be returned instead of 400: Bad Request if it has unaccepted state relation

Enhancement to Update [Optional]

Definition of Done

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

Estimation

1 hour

[gaurivn]

@anitab-org/mentorship-managers, I would like to work on this issue.

[vj-codes]

Sure assigning you @gaurivn
Happy coding:)