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feat(studio): toggle pg_graphql introspection from GraphiQL (#46170)

## Summary

- pg_graphql 1.6+ disables schema introspection by default, which breaks
GraphiQL's docs explorer and field autocomplete. This PR adds an in-app
notice + confirmation flow so users can opt into (or later opt out of)
introspection without leaving the GraphQL tab.
- Introspection state is read from, and written to, the `@graphql(...)`
directive embedded in the target schema's Postgres comment (`public` by
default). Other directive options the user has set are preserved when
the introspection key is toggled.
- Ships `parseSchemaComment` / `buildSchemaCommentWith` helpers (with
unit tests) and a `useSetIntrospection` mutation hook, plus collapsible
disabled-state and dismissible enabled-state notices rendered above
GraphiQL. GraphiQL is re-mounted after a toggle so it re-runs
introspection.

## Test plan

- [ ] On a project with pg_graphql >= 1.6 and introspection disabled:
disabled-state notice appears, confirm modal shows the SQL that will
run, enabling re-mounts GraphiQL and populates the docs explorer.
- [ ] On a project with introspection enabled: small enabled-state
banner appears, disabling clears the docs explorer and updates the
schema comment.
- [ ] Existing `@graphql({...})` options (e.g. `inflect_names`,
`max_rows`) survive a toggle; malformed directive text is replaced and a
warning is shown in the confirm modal.
- [ ] On pg_graphql < 1.6 (or extension not installed): no notice
renders, GraphiQL behaves as before.
- [ ] Collapsed-disabled-notice state persists per project via local
storage.

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

* **New Features**
  * GraphQL introspection toggle with enable/disable confirmation modal.
* Notices showing current introspection state with controls to change
it.
* GraphiQL automatically remounts and updates when introspection status
changes.
* Per-project persisted colla... (continued)

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