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POC: bring back MSW to remove the pattern of vi.mock (#46439)

## 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?

Right now our tests for API mocking is using vi.mock and mocking that
query or fetch handler. This is not the right approach IMO, 2 years ago
@jordienr added MSW with some very powerful helpers. The idea is to move
component test that rely on API using MSW within ViteTest. Principles
are simple:
- Mock API responses
- Mount your component that uses API responses
- Tests and assert on UI 
- Added Skill for Clanker

This pattern is 100 times better than what we have

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

* **Tests**
* Expanded and strengthened test suites for secrets, org lookup, support
flows, OAuth auth, and onboarding; mocks now use contract-backed
responses for more realistic coverage.

* **Documentation**
* Added a comprehensive guide describing a standardized pattern for
component tests that mock network requests.

* **Chores**
* Improved test helpers, typing for API mocks, and test runner
configuration for more reliable and maintainable tests.

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Co-authored-by: Alaister Young <alaister@users.noreply.github.com>
Co-authored-by: Alaister Young <10985857+alaister@users.noreply.github.com>

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