Allow specifying system for Identity references in app resources (#4924)

* Update configuration

* Regenerate files

* Update after rebase

* fixup! Update after rebase

* Add documentation

* Rename file.

Author: theunrepentantgeek

v2/api/app/v1api20240301/container_app_types_gen.go

@@ -402,13 +402,13 @@ ContainerApp: Resource
 │   │   ├── MaxInactiveRevisions: *int
 │   │   ├── PropertyBag: genruntime.PropertyBag
 │   │   ├── Registries: Object (5 properties)[]
-│   │   │   ├── IdentityReference: *genruntime.ResourceReference
+│   │   │   ├── IdentityReference: *genruntime.WellKnownResourceReference
 │   │   │   ├── PasswordSecretRef: *string
 │   │   │   ├── PropertyBag: genruntime.PropertyBag
 │   │   │   ├── Server: *string
 │   │   │   └── Username: *string
 │   │   ├── Secrets: Object (5 properties)[]
-│   │   │   ├── IdentityReference: *genruntime.ResourceReference
+│   │   │   ├── IdentityReference: *genruntime.WellKnownResourceReference
 │   │   │   ├── KeyVaultUrl: *string
 │   │   │   ├── Name: *string
 │   │   │   ├── PropertyBag: genruntime.PropertyBag
@@ -821,7 +821,7 @@ Job: Resource
 │   │   │   └── ReplicaCompletionCount: *int
 │   │   ├── PropertyBag: genruntime.PropertyBag
 │   │   ├── Registries: Object (5 properties)[]
-│   │   │   ├── IdentityReference: *genruntime.ResourceReference
+│   │   │   ├── IdentityReference: *genruntime.WellKnownResourceReference
 │   │   │   ├── PasswordSecretRef: *string
 │   │   │   ├── PropertyBag: genruntime.PropertyBag
 │   │   │   ├── Server: *string
@@ -834,7 +834,7 @@ Job: Resource
 │   │   │   ├── PropertyBag: genruntime.PropertyBag
 │   │   │   └── ReplicaCompletionCount: *int
 │   │   ├── Secrets: Object (5 properties)[]
-│   │   │   ├── IdentityReference: *genruntime.ResourceReference
+│   │   │   ├── IdentityReference: *genruntime.WellKnownResourceReference
 │   │   │   ├── KeyVaultUrl: *string
 │   │   │   ├── Name: *string
 │   │   │   ├── PropertyBag: genruntime.PropertyBag

v2/api/app/v1api20240301/storage/container_app_types_gen.go

@@ -353,12 +353,12 @@ ContainerApp: Resource
 │   │   │       └── "tcp"
 │   │   ├── MaxInactiveRevisions: *int
 │   │   ├── Registries: Object (4 properties)[]
-│   │   │   ├── IdentityReference: *genruntime.ResourceReference
+│   │   │   ├── IdentityReference: *genruntime.WellKnownResourceReference
 │   │   │   ├── PasswordSecretRef: *string
 │   │   │   ├── Server: *string
 │   │   │   └── Username: *string
 │   │   ├── Secrets: Object (4 properties)[]
-│   │   │   ├── IdentityReference: *genruntime.ResourceReference
+│   │   │   ├── IdentityReference: *genruntime.WellKnownResourceReference
 │   │   │   ├── KeyVaultUrl: *string
 │   │   │   ├── Name: *string
 │   │   │   └── Value: *genruntime.SecretReference
@@ -748,7 +748,7 @@ Job: Resource
 │   │   │   ├── Parallelism: *int
 │   │   │   └── ReplicaCompletionCount: *int
 │   │   ├── Registries: Object (4 properties)[]
-│   │   │   ├── IdentityReference: *genruntime.ResourceReference
+│   │   │   ├── IdentityReference: *genruntime.WellKnownResourceReference
 │   │   │   ├── PasswordSecretRef: *string
 │   │   │   ├── Server: *string
 │   │   │   └── Username: *string
@@ -759,7 +759,7 @@ Job: Resource
 │   │   │   ├── Parallelism: *int
 │   │   │   └── ReplicaCompletionCount: *int
 │   │   ├── Secrets: Object (4 properties)[]
-│   │   │   ├── IdentityReference: *genruntime.ResourceReference
+│   │   │   ├── IdentityReference: *genruntime.WellKnownResourceReference
 │   │   │   ├── KeyVaultUrl: *string
 │   │   │   ├── Name: *string
 │   │   │   └── Value: *genruntime.SecretReference