Recognize and return TENANT_ID_MISMATCH error code (#2389)

Error was already present, but wasn't wired in.

Author: rsgowman

packages/auth/src/rpchandler.js

@@ -2511,6 +2511,8 @@ fireauth.RpcHandler.getDeveloperError_ =
       fireauth.authenum.Error.UNSUPPORTED_TENANT_OPERATION;
   errorMap[fireauth.RpcHandler.ServerError.INVALID_TENANT_ID] =
       fireauth.authenum.Error.INVALID_TENANT_ID;
+  errorMap[fireauth.RpcHandler.ServerError.TENANT_ID_MISMATCH] =
+      fireauth.authenum.Error.TENANT_ID_MISMATCH;
 
   // User actions (sign-up or deletion) disabled errors.
   errorMap[fireauth.RpcHandler.ServerError.ADMIN_ONLY_OPERATION] =

packages/auth/test/rpchandler_test.js

@@ -2436,6 +2436,8 @@ function testVerifyCustomToken_serverCaughtError() {
       fireauth.authenum.Error.CREDENTIAL_MISMATCH;
   errorMap[fireauth.RpcHandler.ServerError.INVALID_TENANT_ID] =
       fireauth.authenum.Error.INVALID_TENANT_ID;
+  errorMap[fireauth.RpcHandler.ServerError.TENANT_ID_MISMATCH] =
+      fireauth.authenum.Error.TENANT_ID_MISMATCH;
 
   assertServerErrorsAreHandled(function() {
     return rpcHandler.verifyCustomToken(token);