test(acl): diploma document sets indicatiegebruiksrecht so the zaak can close (refs #103)

The behandelaar approval closes the zaak via OpenZaak. A related
informatieobject with indicatieGebruiksrecht left null makes OpenZaak
reject the close (400 indicatiegebruiksrecht-unset), surfacing as a 500
and failing the registration e2e flow.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

services/acl/Acl.IntegrationTests/OpenZaakGatewayIntegrationTests.cs

@@ -118,6 +118,9 @@ public sealed class OpenZaakGatewayIntegrationTests(OpenZaakFixture stack)
         Assert.Equal("diploma.pdf", doc.GetProperty("bestandsnaam").GetString());
         Assert.Equal(informatieobjecttype.ToString(), doc.GetProperty("informatieobjecttype").GetString());
         Assert.Equal(content.Length, doc.GetProperty("bestandsomvang").GetInt32());
+        // indicatieGebruiksrecht is recorded as "no restrictions"; left null, OpenZaak would refuse to
+        // close the zaak this document is related to (the S-10b regression that broke the e2e flow).
+        Assert.False(doc.GetProperty("indicatiegebruiksrecht").GetBoolean());
 
         // ...and it is related to the zaak (a zaakinformatieobject links the two).
         var relations = await stack.GetJsonAsync(new Uri(stack.BaseUrl,