[Business Approvals Kit - Feature]: Add new parameter "External Reference" in custom connector

[shrikant-singh31]

Is your feature request related to a problem? Please describe.

Currently we cannot update the approval outcome to the source as we do not have any provision to store reference of the external source.

Describe the solution you'd like

This change will require the following updates: 1.Add a new optional parameter to the custom connector. 2.Add a new External Identifier column to the Business Approval Workflow table.

3. Update flow to store reference in above table.

Describe alternatives you've considered

No response

Additional context?

No response

AB#2178

[Grant-Archibald-MS]

Included in February 2024 Release https://github.com/microsoft/powercat-business-approvals-kit/releases/tag/BusinessApprovalKit-February2024