Add EF Core migration for ProposalProvenance FK to AutomationProposals

New migration adds the foreign key constraint on ProposalProvenances
.ProposalId referencing AutomationProposals.Id with cascade delete.

Author: Chris0Jeky

backend/src/Taskdeck.Infrastructure/Migrations/TaskdeckDbContextModelSnapshot.cs

@@ -2306,6 +2306,15 @@ protected override void BuildModel(ModelBuilder modelBuilder)
                     b.Navigation("Proposal");
                 });
 
+            modelBuilder.Entity("Taskdeck.Domain.Entities.ProposalProvenance", b =>
+                {
+                    b.HasOne("Taskdeck.Domain.Entities.AutomationProposal", null)
+                        .WithOne()
+                        .HasForeignKey("Taskdeck.Domain.Entities.ProposalProvenance", "ProposalId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
             modelBuilder.Entity("Taskdeck.Domain.Entities.ProposalRevision", b =>
                 {
                     b.HasOne("Taskdeck.Domain.Entities.AutomationProposal", "Proposal")