Enable the no-new-symbol and require-yield ESLint rules

Given that we use both `Symbol`s and generator functions in the code-base enabling these rules cannot hurt (and there's no existing failures). Please find additional information at:
 - https://eslint.org/docs/latest/rules/no-new-symbol
 - https://eslint.org/docs/latest/rules/require-yield

.eslintrc

@@ -142,9 +142,10 @@
     "no-lone-blocks": "error",
     "no-lonely-if": "error",
     "no-multi-str": "error",
+    "no-new": "error",
     "no-new-func": "error",
+    "no-new-symbol": "error",
     "no-new-wrappers": "error",
-    "no-new": "error",
     "no-octal-escape": "error",
     "no-octal": "error",
     "no-redeclare": "error",
@@ -257,6 +258,7 @@
       "avoidQuotes": true,
     }],
     "prefer-const": "error",
+    "require-yield": "error",
     "sort-imports": ["error", {
       "ignoreCase": true,
     }],