supabase / supabase / 26877589422

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feat(studio): add Multigres logs collection for HA projects (#46499)

## Problem

High availability (Multigres) projects don't expose Multigres service
logs in the Studio logs UI, so users on HA projects have no entry point
to inspect them.

## Fix

Add a `Multigres` logs collection, gated behind the `multigresLogs`
ConfigCat flag **and** the project's `high_availability` flag
(`useShowMultigresLogs`):

- New `Multigres` entry in the logs sidebar `Collections`, linking to a
new `multigres-logs` page that queries the `multigres_logs` table.
- Wire `multigres_logs` through the logs constants, types, table SQL,
query type, and service labels.
- Row formatting: parse the JSON `event_message` and render `level`
through `SeverityFormatter` and `msg` through `TextFormatter`, matching
the other service collections (instead of dumping raw JSON).
- `WARN` severity is now styled like `WARNING` (amber), since Multigres
emits `level: WARN`.
- Log detail drawer: parse the JSON `event_message` and spread its keys
onto the log so each field (level, msg, query, error, connection_id,
etc.) renders as its own collapsible row.
- Single-log query omits the `metadata` column for `multigres_logs` (the
table has no such column), fixing an `INVALID_ARGUMENT` error when
opening the detail drawer.
- Event chart: parse the level out of `event_message` via `JSON_VALUE`
so error/warning bars are counted (the table has no top-level level
column).
- Add the `multigres_logs` source schema to the Field Reference drawer,
same gating.

## Why a feature flag

`high_availability` is an existing product feature that predates
Multigres, so existing HA projects could otherwise see a broken
collection querying a `multigres_logs` table they don't have. Requiring
the `multigresLogs` flag ships the feature dark and decouples rollout
from HA status. The flag must be created in ConfigCat before enabling;
until then `useFlag` returns false and the feature stays hidden.

## How to test

- Enable the... (continued)

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