## Context
Related to database connections - specifically for cancelling queries or
terminating sessions
PIDs can be re-used, so a more accurate check is to use both PID and
`backend_start` to uniquely identify the session to cancel or terminate
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Improved query cancellation and session termination reliability by
verifying the active database session before taking action.
* Prevented actions from affecting a different session that reused the
same process ID.
* Added clearer guidance to refresh when a session has changed or is no
longer available.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## Context
Related to Database Connections
- Adds a "cancel query" action for "active" sessions using
`pg_cancel_backend`
- Gentler alternative as the connection stays alive, unlike terminating
the session
- Not applicable for queries idle in transaction as there's no query
running (Disabled in this case)
- Rename "Terminate" to "Terminate session"
- Rename "Abort query" to "Terminate session"
For active queries:
<img width="220" height="135" alt="image"
src="https://github.com/user-attachments/assets/d6ca790d-bb6a-4582-8554-24431388483a"
/>
For idle in txn queries:
<img width="433" height="135" alt="image"
src="https://github.com/user-attachments/assets/615d0651-9f5b-4efc-a5cf-72f93727aa91"
/>
Also updating confirmation modal for terminating session CTA:
For active queries:
<img width="407" height="301" alt="image"
src="https://github.com/user-attachments/assets/e5f56764-11b9-4c10-ba01-d7547aaec872"
/>
All other queries:
<img width="410" height="212" alt="image"
src="https://github.com/user-attachments/assets/8631633f-5d4a-40a7-b089-6980a5180219"
/>
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## New Features
- Added a separate **Cancel query** action for active database queries.
- Added **Terminate session** to close connections and roll back active
transactions.
- Added safeguards based on query activity and permissions.
- Added confirmation guidance for active queries, including cancellation
options.
- Added loading, success, and error feedback for query cancellation and
session termination.
- Added telemetry for query-cancellation actions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
