[pull] master from supabase:master - #1115

Update to reflect actual funcionality and give more tips to fix the
issue.

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Update troubleshoot guides.



<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Documentation**
- Clarified when missing daily partitions trigger the
`WarnSendingBroadcastMessage` warning.
- Updated guidance to explain that partitions are created only after a
client connects via WebSocket.
- Removed the tenant health check endpoint as a described
partition-creation trigger.
- Added troubleshooting steps for connection/authentication failures,
including checking realtime logs, using the Realtime Inspector, and
verifying JWT settings/remediation.
- Revised janitor timing and partition maintenance behavior, including
scenarios where clients cannot connect.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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