Improve realtime update resilience with request retries and out-of-range data validation

[FelixINX]

This PR improves the resiliency of the background processes handling real-time data updates.

1. Network Resilience (DispatchAgency.php): Added a 10-second timeout and a retry mechanism (3 attempts, 100ms apart) to the Http::get call that fetches transit feed data. A custom closure now ensures it retries on connection exceptions (e.g., cURL error 28 timeouts) and explicitly on 5xx and 400 errors, mitigating transient network failures.
2. Data Integrity & Bounds Validation (GtfsRtHandler.php, JavascriptGtfsRtHandler.php, NextbusJsonHandler.php): Implemented strict validation checks for real-time data before it is inserted into the database. This prevents database "out of range" errors:
   • Coordinates: Latitude must be between -90 and 90, Longitude must be between -180 and 180.
   • Speed: Must be between 0 and 150 km/h.
   • Odometer: Must be between 0 and 10,000,000.
   • Bearing: Must be between 0 and 360 degrees.
   • Any out-of-bounds value is safely set to null.
   • Removed an agency-specific hardcoded exception for the London Transit Commission (ltc), since the coordinate bounds validation now safely handles invalid positional data globally for all agencies.

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PR created automatically by Jules for task 14159488042253352629 started by @FelixINX

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