refactor(eslint): change unused vars rule to error and update error handling in services

- Update ESLint configuration to set `@typescript-eslint/no-unused-vars` from 'warn' to 'error' for stricter linting.
- Refactor error handling in various services to omit error variable in catch blocks for cleaner code.

.eslintrc.js

@@ -26,7 +26,7 @@ module.exports = {
     '@typescript-eslint/no-explicit-any': 'off',
     '@typescript-eslint/no-empty-function': 'off',
     '@typescript-eslint/no-non-null-assertion': 'off',
-    '@typescript-eslint/no-unused-vars': 'warn',
+    '@typescript-eslint/no-unused-vars': 'error',
     'import/first': 'error',
     'import/no-duplicates': 'error',
     'simple-import-sort/imports': 'error',