🚨(eslint) add no-unnecessary-type-assertion lint rule

Add no-unnecessary-type-assertion rule to eslint
config to avoid automatically unnecessary type
assertions in the codebase.

src/frontend/packages/eslint-plugin-docs/typescript.js

@@ -24,6 +24,7 @@ const typescriptConfig = {
   rules: {
     '@typescript-eslint/no-explicit-any': 'error',
     '@typescript-eslint/no-non-null-assertion': 'error',
+    '@typescript-eslint/no-unnecessary-type-assertion': 'error',
     '@typescript-eslint/no-unsafe-argument': 'error',
     '@typescript-eslint/no-unsafe-member-access': 'error',
     '@typescript-eslint/no-unused-vars': [