supabase / supabase / 27330943136

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feat(studio): add Snowflake replication destination (#46767)

## Details of change

Adds Snowflake to the Studio replication destination flow:
- destination selection and display
- create/edit form fields
- validate/create/update payload serialization
- generated Platform API types

Snowflake remains gated behind `etlEnableSnowflakePrivateAlpha`.

**Note:** I have configured `etlEnableSnowflakePrivateAlpha` in
ConfigCat ("all" in staging and tied to my own org id in prod).

## Details of Verification Process

- Studio focused Vitest coverage for form serialization and diagram
mapping
- Studio typecheck
- ESLint on changed Studio replication files
- Local `mise fullstack:dev` smoke test to confirm the Snowflake form
renders ok.

<img width="937" height="569" alt="image"
src="https://github.com/user-attachments/assets/8d6b3a87-1f9d-4a59-91da-be719714ea49"
/>


Full create/validate E2E depends on the Platform PR and ETL runtime
rollout.


## Review Requests

Please check the Snowflake wire payload matches the Platform/ETL
contract and that gating/edit/display behavior follows the existing ETL
destination patterns.

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

* **New Features**
* Snowflake added as a supported replication destination (private-alpha
gated), including UI for selecting and configuring connection and auth
(account, user, database, schema, role, private key, optional
passphrase).
* **Validation**
* Form validation and submission now handle Snowflake-specific
required/optional fields.
* **Tests**
* Unit tests added for Snowflake form behavior and replication-type
detection.
* **API**
* Destination create/update/validate flows extended to accept Snowflake
payloads.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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