refactor(tests): rename createRealChargingStation to createMockChargingStation

refactor(tests): rename createRealChargingStation to createMockChargingStation

- Rename function to reflect its nature as a lightweight stub, not a real instance
- Update all usages in ChargingStation.test.ts
- Add EVSE 0 with connector 0 for station-level availability checks in EVSE mode
- Add StopTransactionReason parameter to stop() method signature
- Add comment explaining deleteConfiguration parameter usage in delete()
- Update interface and type names to match (MockChargingStationOptions/Result)
- Update JSDoc and file header to reflect mock terminology