Updated frontend data model with backend changes
Specifically:
- Renamed Proposal to ProposalCopy (STT-1024)
- Created Proposal entity containing 2 ProposalCopies, ProposalCode, State (STT-1025)
- Renamed Proposal.status to Proposal.state (STT-1026)
NRAO Gitlab has been upgraded to version 17.6.2
Specifically: