Add com.unity.multiplayer.tools 2.2.9 (Network Simulator)

Installs the Multiplayer Tools package to simulate poor network
conditions (delay/jitter/drop) in the editor/dev builds, replacing the
Debug Simulator inspector fields removed in UnityTransport 2.x.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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