[BACKEND] allow changing status of a DELEGATED PIA from MPO_REVIEW to CPO_REVIEW

[kushal-arora-fw]

Description

This PR includes the following proposed change(s):

Due to the change in the Product direction, allowing changing status of a DELEGATED PIA from MPO_REVIEW to CPO_REVIEW

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring / Documentation
• Updating Testing Framework(s)
• Version change

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

Development Dependency Working Agreement

• My code DOES NOT include the importing of new dependencies into the DPIA ecosystem
• My code DOES include the importing of new dependencies into the DPIA ecosystem
  If new dependencies are being introduced to the DPIA ecosystem:
• The functionality of the dependency drastically reduces code complexity and makes my changes more easily maintainable and readible
• The dependency being introduced does not contain multiple layers of nested dependencies introducing maintainability complexity to the DPIA ecosystem

Frontend Development Changes

• N/A
• I have performed a self-review of my own code
• I have made corresponding changes to project documentation or diagrams that reflect my changes
• New and existing unit tests pass locally with my changes
• My code follows Airbnb React Style Guidelines

API Development Changes

• N/A
• I have performed a self-review of my own code
• My code follows standards and practices outlined in the BC Government API Development Guidelines
• New and existing unit tests pass locally with my changes
• My changes includes Swagger documentation updates that reflect the changes I am introducing

Definition of Done