supabase / supabase / 29942804737

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test(sql-editor): shared renderHook harness with in-memory editor port (#48209)

## Summary

- Add `renderSqlEditorHook()` test harness that eliminates mocking
Monaco by injecting a real, deterministic in-memory editor port
(EditorController/DiffController backed by plain JS state)
- Include `createInMemoryEditor()`, `resetSqlEditorStores()`, and
`setupSqlEditorMocks()` utilities to provide isolation and mock-free
network testing via MSW handlers
- Export `CustomWrapper` from custom-render and add optional
`editor`/`diff` injection points to SQLEditorProvider (production
unaffected via null-coalesce fallback)

This is **Step 3** of an in-progress SQL editor testability refactor
(Step 2 finished EditorController/DiffController port; this harness has
no consumers yet — hook tests land in a follow-up step).

## Test plan

- [x] `pnpm --filter studio typecheck` passes (already verified)

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

## Summary by CodeRabbit

* **Tests**
* Added reusable SQL Editor test utilities for in-memory editing,
selections, error highlighting, snippets, and diff content.
* Added helpers for resetting editor state, configuring API mocks, and
rendering SQL Editor hooks in a complete test environment.
* Enabled SQL Editor providers to accept optional controller overrides
for isolated testing.
  * Exported the shared test wrapper for reuse across test suites.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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