legacy and flat config got out of sync

[chancancode]

1. Context: Overload signatures causes [no-redeclare]error from eslint ember-tooling/ember-eslint-parser#129
2. Arguably, ultimately due to: Bug: rules from @typescript-eslint/eslint-recommended cannot be applied to files with custom file extensions typescript-eslint/typescript-eslint#8607
3. But @patricklx tried to solve that here in include recommended ts-eslint rules for gts #2107
4. But that only got applied to the flat config, not the legacy config