Create 'Cut RC' workflow stub

[vgrassia]

Type of change

- [ ] Bug fix
- [ ] New feature development
- [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [X] Build/deploy pipeline (DevOps)
- [ ] Other

Objective

This PR creates a stub workflow that will eventually be a workflow to cut the RC branch automatically. This is moving from the DevOps repo due to permission issues with the GitHub Token when calling workflows from another repository.

Code changes

• .github/workflows/cut-rc.yml: Add file for workflow stub.

Before you submit

• Please check for formatting errors (dotnet format --verify-no-changes) (required)
• If making database changes - make sure you also update Entity Framework queries and/or migrations
• Please add unit tests where it makes sense to do so (encouraged but not required)
• If this change requires a documentation update - notify the documentation team
• If this change has particular deployment requirements - notify the DevOps team

[vgrassia]

Didn't end up needing this, but thank you for the review!