feat(eslint-config): enable return-await

BREAKING CHANGE: The linter will reject code using `return await`
ouside of `try` blocks or forgetting to `await` before returning
from inside a `try` block.
Migration guide: use `return` outside of `try` blocks and `return await`
inside `try` blocks.

Signed-off-by: Miroslav Bajtoš <mbajtoss@gmail.com>

packages/eslint-config/eslintrc.js

@@ -152,6 +152,7 @@ module.exports = {
     '@typescript-eslint/prefer-optional-chain': 'error',
     '@typescript-eslint/prefer-nullish-coalescing': 'error',
     '@typescript-eslint/no-extra-non-null-assertion': 'error',
+    '@typescript-eslint/return-await': 'error',
   },
 
   overrides: [