tests: remove empty strings in string literals (graphql#3970)

Author: IvanGoncharov

.eslintrc.cjs

@@ -347,7 +347,14 @@ module.exports = {
     'no-restricted-globals': 'off',
     'no-restricted-imports': 'off',
     'no-restricted-properties': 'off',
-    'no-restricted-syntax': 'off',
+    'no-restricted-syntax': [
+      'error',
+      {
+        selector: 'TemplateElement[value.raw=/ \\n/]',
+        message:
+          'String literals should not contain trailing spaces. If needed for tests please disable locally using eslint comment',
+      },
+    ],
     'no-return-assign': 'error',
     'no-return-await': 'error',
     'no-script-url': 'error',

src/__testUtils__/kitchenSinkQuery.ts

@@ -15,7 +15,7 @@ query queryName(
           ...frag @onFragmentSpread
         }
       }
-      
+
       field3!
       field4?
       requiredField5: field5!

src/utilities/__tests__/printSchema-test.ts

@@ -680,7 +680,7 @@ describe('Type System Printer', () => {
       schema {
         query: Query
       }
-      
+
       """"""
       directive @someDirective(
         """"""