Fix Kura gateway scheduling on bare-metal cache nodes

Bare-metal Kura cache nodes carry a tuist.dev/kura-cache=true:NoSchedule taint that keeps general workloads off the box. The host-network regional gateway was pinned to that node but lacked the matching toleration, so it stayed in FailedScheduling, leaving public cache endpoints (eu-central, us-east, us-west) unreachable and the dashboard stuck at ‘Deploying’. This release gives the gateway pod template and manifest the same toleration the cache pods already use, so it can now schedule and serve traffic on those regions.