## Context
For database extensions, previously dashboard would fire a separate call
just to retrieve the "default schema" for an extension via
`useDatabaseExtensionDefaultSchemaQuery` from the
`pg_available_extension_versions` table (the `schema` from this table
implies where the extension will be installed in)
## Changes involved
Am updating the `useDatabaseExtensionsQuery` to use a custom studio SQL
that will fetch this data in one request via a `LEFT JOIN`, so dashboard
no longer needs to fire a request to `pg_available_extension_versions`
each time we open the `EnableExtensionModal` since all the info we need
is loaded up front.
Have also validated that the cost of the custom studio SQL is low (6.8,
via explain analyze) so performance wise on the project's DB should be
okay.
This will then also allow us to correctly render the "default schema" of
the extensions in the new Install Integration Sheet now that we have
that information up front.
## Misc fix
Also fixed a small issue on the database extensions page whereby if you
searched for an extension that's hidden (e.g pg_tle), there's no "No
results" UI state showing up
<img width="1112" height="319" alt="image"
src="https://github.com/user-attachments/assets/eb488117-2a24-4317-ad73-1d636f9b1bc8"
/>
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Per-extension default schema detection surfaced across install flows;
default schema options added to selectors when applicable.
* **Bug Fixes**
* Hidden extensions filtered out earlier so they no longer appear in
lists.
* Install button now correctly disables when required extensions are
missing.
* **Refactor**
* Consolidated extensions metadata retrieval and simplified schema
selection/validation logic; UI text formatting standardized.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## Context
Related to marketplace related work, just moves the Queues integration
to the new UI (Changes are feature flagged)
<img width="1145" height="584" alt="image"
src="https://github.com/user-attachments/assets/d3245889-597d-44e2-9850-f20907e42056"
/>
Installation is now in a side panel with the intention that it'll just
be a single click to install integrations that involve multiple parts
<img width="400" height="955" alt="image"
src="https://github.com/user-attachments/assets/71903b61-6bd2-486c-903e-b48ae2133887"
/>
## To test
- Verify that you can install the integration and everything else should
be status quo
- Verify that everything should be status quo if the flag is off
