added testCaseId

Author: engcom-Echo

app/code/Magento/Checkout/Test/Mftf/Test/StorefrontOnePageCheckoutPhoneValidationTest.xml

@@ -15,6 +15,7 @@
             <title value="Validate phone field on checkout page"/>
             <description value="Validate phone field on checkout page, field must not contain alphabetical symbols"/>
             <severity value="MAJOR" />
+            <testCaseId value="MC-35292"/>
         </annotations>
         <before>
             <createData entity="_defaultCategory" stepKey="createCategory"/>