fix: Change connector boot status to be available at boot (#1641)

fix: Change connector boot status to be available at boot (#1641)

* fix: connector boot status available by default

* fix: connector boot status available by default

* chore: add unit tests to getBootConnectorStatus

* fix: refine connector boot status logic based on reviewer feedback

- Restore charging station and connector availability checks
- Only restore previous status when transaction is in progress (transactionStarted === true)
- Add isChargingStationAvailable() method to test factory
- Add comprehensive tests for all scenarios including:
  - Charging station/connector unavailable
  - Transaction in progress (restore previous status)
  - Boot status from template
  - Default to Available

Addresses review feedback from PR #1641 about properly handling:
- Station/connector availability
- Conditional previous status restoration
- Transaction state considerations

* refactor: remove redundant comments from getBootConnectorStatus

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Co-authored-by: Jérôme Benoit <jerome.benoit@sap.com>
Co-authored-by: Jérôme Benoit <jerome.benoit@piment-noir.org>