perf(oidc): disable push of user token meta-event (#8691)

# Which Problems Are Solved

When executing many concurrent authentication requests on a single
machine user, there were performance issues. As the same aggregate is
being searched and written to concurrently, we traced it down to a
locking issue on the used index.
We already optimized the token endpoint by creating a separate OIDC
aggregate.

At the time we decided to push a single event to the user aggregate, for
the user audit log. See [technical advisory
10010](https://zitadel.com/docs/support/advisory/a10010) for more
details.

However, a recent security fix introduced an additional search query on
the user aggregate, causing the locking issue we found.

# How the Problems Are Solved

Add a feature flag which disables pushing of the `user.token.v2.added`.
The event has no importance and was only added for informational
purposes on the user objects. The `oidc_session.access_token.added` is
the actual payload event and is pushed on the OIDC session aggregate and
can still be used for audit trail.

# Additional Changes

- Fix an event mapper type for
`SystemOIDCSingleV1SessionTerminationEventType`

# Additional Context

- Reported by support request
- https://github.com/zitadel/zitadel/pull/7822 changed the token
aggregate
- https://github.com/zitadel/zitadel/pull/8631 introduced user state
check

Load test trace graph with `user.token.v2.added` **enabled**. Query
times are steadily increasing:


![image](https://github.com/user-attachments/assets/4aa25055-8721-4e93-b695-625560979909)

Load test trace graph with `user.token.v2.added` **disabled**. Query
times constant:


![image](https://github.com/user-attachments/assets/a7657f6c-0c55-401b-8291-453da5d5caf9)

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/api/grpc/feature/v2/converter.go

@@ -18,6 +18,7 @@ func systemFeaturesToCommand(req *feature_pb.SetSystemFeaturesRequest) *command.
 		TokenExchange:                   req.OidcTokenExchange,
 		ImprovedPerformance:             improvedPerformanceListToDomain(req.ImprovedPerformance),
 		OIDCSingleV1SessionTermination:  req.OidcSingleV1SessionTermination,
+		DisableUserTokenEvent:           req.DisableUserTokenEvent,
 	}
 }
 
@@ -32,6 +33,7 @@ func systemFeaturesToPb(f *query.SystemFeatures) *feature_pb.GetSystemFeaturesRe
 		Actions:                             featureSourceToFlagPb(&f.Actions),
 		ImprovedPerformance:                 featureSourceToImprovedPerformanceFlagPb(&f.ImprovedPerformance),
 		OidcSingleV1SessionTermination:      featureSourceToFlagPb(&f.OIDCSingleV1SessionTermination),
+		DisableUserTokenEvent:               featureSourceToFlagPb(&f.DisableUserTokenEvent),
 	}
 }
 
@@ -47,6 +49,7 @@ func instanceFeaturesToCommand(req *feature_pb.SetInstanceFeaturesRequest) *comm
 		WebKey:                          req.WebKey,
 		DebugOIDCParentError:            req.DebugOidcParentError,
 		OIDCSingleV1SessionTermination:  req.OidcSingleV1SessionTermination,
+		DisableUserTokenEvent:           req.DisableUserTokenEvent,
 	}
 }
 
@@ -63,6 +66,7 @@ func instanceFeaturesToPb(f *query.InstanceFeatures) *feature_pb.GetInstanceFeat
 		WebKey:                              featureSourceToFlagPb(&f.WebKey),
 		DebugOidcParentError:                featureSourceToFlagPb(&f.DebugOIDCParentError),
 		OidcSingleV1SessionTermination:      featureSourceToFlagPb(&f.OIDCSingleV1SessionTermination),
+		DisableUserTokenEvent:               featureSourceToFlagPb(&f.DisableUserTokenEvent),
 	}
 }
 

internal/api/grpc/feature/v2/converter_test.go

@@ -119,6 +119,10 @@ func Test_systemFeaturesToPb(t *testing.T) {
 			Enabled: true,
 			Source:  feature_pb.Source_SOURCE_SYSTEM,
 		},
+		DisableUserTokenEvent: &feature_pb.FeatureFlag{
+			Enabled: false,
+			Source:  feature_pb.Source_SOURCE_UNSPECIFIED,
+		},
 	}
 	got := systemFeaturesToPb(arg)
 	assert.Equal(t, want, got)
@@ -243,6 +247,10 @@ func Test_instanceFeaturesToPb(t *testing.T) {
 			Enabled: true,
 			Source:  feature_pb.Source_SOURCE_INSTANCE,
 		},
+		DisableUserTokenEvent: &feature_pb.FeatureFlag{
+			Enabled: false,
+			Source:  feature_pb.Source_SOURCE_UNSPECIFIED,
+		},
 	}
 	got := instanceFeaturesToPb(arg)
 	assert.Equal(t, want, got)