feat: instance remove (#4345)

* feat(instance): add remove instance event with projections cleanup

* fix(instance): corrected used id to clean up projections

* fix merge

* fix: correct unit test projection names

* fix: current sequence of lists and query for ensuring keypair based projections

Co-authored-by: Livio Spring <livio.a@gmail.com>
Co-authored-by: Fabi <38692350+hifabienne@users.noreply.github.com>

internal/query/projection/oidc_settings.go

@@ -68,6 +68,15 @@ func (p *oidcSettingsProjection) reducers() []handler.AggregateReducer {
 				},
 			},
 		},
+		{
+			Aggregate: instance.AggregateType,
+			EventRedusers: []handler.EventReducer{
+				{
+					Event:  instance.InstanceRemovedEventType,
+					Reduce: reduceInstanceRemovedHelper(OIDCSettingsColumnInstanceID),
+				},
+			},
+		},
 	}
 }