MC-22838: Required input type values validation does not work correctly

- Resolve remaining test issues

Author: danielrenaud

app/code/Magento/CustomerGraphQl/etc/schema.graphqls

@@ -61,7 +61,7 @@ input CustomerInput {
     middlename: String @doc(description: "The customer's middle name")
     lastname: String @doc(description: "The customer's family name")
     suffix: String @doc(description: "A value such as Sr., Jr., or III")
-    email: String! @doc(description: "The customer's email address. Required")
+    email: String @doc(description: "The customer's email address. Required for customer creation")
     dob: String @doc(description: "Deprecated: Use `date_of_birth` instead")
     date_of_birth: String @doc(description: "The customer's date of birth")
     taxvat: String @doc(description: "The customer's Tax/VAT number (for corporate customers)")

dev/tests/api-functional/testsuite/Magento/GraphQl/AuthorizenetAcceptjs/Customer/SetPaymentMethodTest.php

@@ -136,7 +136,7 @@ public function testSetPaymentInvalidInput(\Closure $getMutationClosure, array $
 
         $setPaymentMutation = $getMutationClosure($maskedQuoteId);
 
-        foreach($expectedMessages as $expectedMessage){
+        foreach ($expectedMessages as $expectedMessage) {
             $this->expectExceptionMessage($expectedMessage);
         }
         $this->graphQlMutation($setPaymentMutation, [], '', $this->getHeaderMap());

dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddVirtualProductToCartTest.php

@@ -57,7 +57,7 @@ public function testAddVirtualProductToCart()
     /**
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      * @expectedException Exception
-     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     * @expectedExceptionMessage Field AddSimpleProductsToCartInput.cart_id of required type String! was not provided.
      */
     public function testAddVirtualProductToCartIfCartIdIsMissed()
     {