Implement GraphQL mutation to allow a user to remove a tracked project security ref

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Once the security_project_refs table has been defined, users need to be able to remove a defined ref from the list of tracked refs for their project to appropriately manage the refs they want to be track.

We need to create a mutation that allows a user to remove a specific security_project_ref from the desired project.

Ideally this should use a common service so that other mechanics can leverage it for the removal of tracked refs at a later state.