## What kind of change does this PR introduce?
Cleanup.
## What is the current behavior?
Temporary access still has a couple of leftover JIT fallback messages
and an unnecessary local unavailable-reason type after the Platform
response types were split into `JitAccessResponse` and
`JitStateResponse`.
## What is the new behavior?
Studio relies on the generated `JitStateResponse` discriminated union
for the toggle warning and uses temporary access copy consistently in
the remaining fallback toasts.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Improvements**
* Refined error messaging for temporary database access grant and revoke
operations.
* Enhanced condition detection for toggle failure warnings in database
access configuration.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Danny White
05fc4aca13