Authn: move namespace id type (#86853)

* Use RoleType from org package

* Move to identity package and re-export from authn

* Replace usage of top level functions for identity

Co-authored-by: Misi <mgyongyosi@users.noreply.github.com>

pkg/services/authn/clients/api_key_test.go

@@ -298,7 +298,7 @@ func TestAPIKey_ResolveIdentity(t *testing.T) {
 		{
 			desc:        "should return error for invalid namespace",
 			namespaceID: authn.MustParseNamespaceID("user:1"),
-			expectedErr: authn.ErrInvalidNamepsaceID,
+			expectedErr: authn.ErrInvalidNamespaceID,
 		},
 		{
 			desc:        "should return error when api key has expired",
@@ -328,7 +328,7 @@ func TestAPIKey_ResolveIdentity(t *testing.T) {
 				OrgID:            1,
 				ServiceAccountId: intPtr(1),
 			},
-			expectedErr: authn.ErrInvalidNamepsaceID,
+			expectedErr: authn.ErrInvalidNamespaceID,
 		},
 		{
 			desc:        "should return error when api key is belongs to different org",