Realtime settings validation in Studio didn't match the backend's actual
limits:
- \`max_presence_events_per_second\` allowed up to 10000 (backend caps
at 5000),
- \`max_payload_size_in_kb\` allowed up to 3000 (backend caps at 10000)
- \`max_events_per_second\` allowed up to 10000 (backend caps at 50000).
Updated the Zod schema limits in both branches of the form's
discriminated union to match.
Fixes FE-3991
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## Summary by CodeRabbit
* **Bug Fixes**
* Increased the allowed limits for realtime event throughput, presence
events, and payload size settings.
* Administrators can now configure higher-capacity realtime workloads,
including payloads up to 10,000 KB.
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