fix(configdb): resync EF model snapshot to clear PendingModelChangesWarning (#32)

The actual drift was NOT OccurredAtUtc's converter (a same-CLR-type
DateTime->DateTime ValueConverter emits no snapshot annotation and never
triggers PendingModelChangesWarning). The real pending change was a HasData
seed row: SecurityConfiguration adds LdapGroupMapping Id=5 (SCADA-Viewers ->
Viewer) but the model snapshot omitted it, so MsSqlMigrationFixture's
MigrateAsync threw PendingModelChangesWarning and failed every fixture-backed
AuditLog MSSQL test (~57).

Generated via `dotnet ef migrations add`; Up/Down are seed-data DML only
(InsertData/DeleteData of the single reference row) -- no schema DDL. The
snapshot now carries the Id=5 seed and has-pending-model-changes is clean.

src/ZB.MOM.WW.ScadaBridge.ConfigurationDatabase/Migrations/ScadaBridgeDbContextModelSnapshot.cs

@@ -925,6 +925,12 @@ namespace ZB.MOM.WW.ScadaBridge.ConfigurationDatabase.Migrations
                             Id = 4,
                             LdapGroupName = "SCADA-Deploy-SiteA",
                             Role = "Deployer"
+                        },
+                        new
+                        {
+                            Id = 5,
+                            LdapGroupName = "SCADA-Viewers",
+                            Role = "Viewer"
                         });
                 });