Consolidated the duplicate `relayListLabel` function from `src/lock-ops.mjs` and `src/lock-publisher.mjs` into `src/utils.mjs`.
- Moved `relayListLabel` to `src/utils.mjs`.
- Updated `src/lock-ops.mjs` and `src/lock-publisher.mjs` to import it.
- Updated `src/lock-utils.mjs` to re-export it from `src/utils.mjs` to maintain backward compatibility.
- Added unit tests in `test/utils.test.mjs`.
- Verified all tests pass.
Co-authored-by: PR0M3TH3AN <[email protected]>