enable no-only-tests rule (#619)

Author: Dimitri POSTOLOV

.eslintrc.js

@@ -30,6 +30,7 @@ module.exports = {
     'unicorn/prefer-array-some': 'error',
     'unicorn/prefer-includes': 'error',
     'eslint-plugin/test-case-shorthand-strings': 'error',
+    'eslint-plugin/no-only-tests': 'error',
     'eslint-plugin/require-meta-docs-url': [
       'error',
       { pattern: 'https://github.com/dotansimha/graphql-eslint/blob/master/docs/rules/{{name}}.md' },

packages/plugin/tests/executable-definitions.spec.ts

@@ -25,7 +25,7 @@ const WITH_SCHEMA = {
 
 const ruleTester = new GraphQLRuleTester();
 
-ruleTester.runGraphQLTests('executable-definitions', GRAPHQL_JS_VALIDATIONS['executable-definitions'] as any, {
+ruleTester.runGraphQLTests('executable-definitions', GRAPHQL_JS_VALIDATIONS['executable-definitions'], {
   valid: [
     {
       ...WITH_SCHEMA,

patches/eslint-plugin-eslint-plugin+3.5.3.patch

@@ -1,3 +1,16 @@
+diff --git a/node_modules/eslint-plugin-eslint-plugin/lib/rules/no-only-tests.js b/node_modules/eslint-plugin-eslint-plugin/lib/rules/no-only-tests.js
+index 78f0c6d..f4f98b1 100644
+--- a/node_modules/eslint-plugin-eslint-plugin/lib/rules/no-only-tests.js
++++ b/node_modules/eslint-plugin-eslint-plugin/lib/rules/no-only-tests.js
+@@ -30,7 +30,7 @@ module.exports = {
+ 
+               const onlyProperty = test.properties.find(
+                 property =>
+-                  property.key.type === 'Identifier' &&
++                  property.key?.type === 'Identifier' &&
+                   property.key.name === 'only' &&
+                   property.value.type === 'Literal' &&
+                   property.value.value
 diff --git a/node_modules/eslint-plugin-eslint-plugin/lib/rules/require-meta-docs-url.js b/node_modules/eslint-plugin-eslint-plugin/lib/rules/require-meta-docs-url.js
 index ed7d67a..af8ea5c 100644
 --- a/node_modules/eslint-plugin-eslint-plugin/lib/rules/require-meta-docs-url.js