bugfix(network): Prevent out-of-bounds access and improve fallback for packet router slots

[seer-by-sentry]

Fixes CLIENT-1AW. The issue was that: DisconnectManager accesses deallocated ConnectionManager data after player disconnection, causing a write access violation.

• Corrected loop bounds for iterating through m_packetRouterFallback array in disconnectPlayer and getNextPacketRouterSlot.
• Added explicit bounds checking before accessing m_packetRouterFallback to prevent potential out-of-bounds reads.
• Ensured m_packetRouterSlot defaults to m_localSlot if no valid fallback is found during player disconnection.
• Modified getNextPacketRouterSlot to return MAX_SLOTS when no subsequent packet router is available, indicating an invalid slot.

This fix was generated by Seer in Sentry, triggered by x64-dev. 👁️ Run ID: 13978503

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