[Feat/add total time field] - 총 달린거리 로직 수정 (#98)

* 🗃️ chore: adjust SQL schema formatting and add `total_time_in_seconds` to `running_record` table

* 🗃️ chore: refine SQL formatting and update `running_record` with `total_time_in_seconds` field

* ✨ add `total_time_in_seconds` and remove calculating total time logic

* ✅ test : apply changes to test