supabase / supabase / 30437483000

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Joshen/fe 4000 activity table to show queries which are blockers (#48383)

## Context

One for Database Connections - allow a user to view the root blocking
queries

Adds an additional filter button here that toggles the view
<img width="738" height="142" alt="image"
src="https://github.com/user-attachments/assets/9fea17ba-c6f6-419d-8847-47dba67fc00a"
/>

When toggled, will render a list of the _root_ blocking queries - these
are queries that are at the end of the blocking chain (or otherwise the
problematic ones causing other queries to be blocked)
<img width="964" height="420" alt="image"
src="https://github.com/user-attachments/assets/5300f523-6abe-49b6-92d0-7e16bbddd291"
/>

Within this view - you can expand the row to view the blocking chain
<img width="950" height="335" alt="image"
src="https://github.com/user-attachments/assets/bb07095a-3841-4db6-8959-ac2bb264ebf6"
/>

## Other changes involved
- Realised that "Top blocker" overview metric card logic is incorrect
- Was previously naively checking the length of the `blocked_by` array,
but it should be consider the nested chain length instead, so this PR
fixes that
<img width="364" height="108" alt="image"
src="https://github.com/user-attachments/assets/89beccef-f6f0-43d1-9dcf-fc35958b09e5"
/>
- Clicking the PID if highlighted on a metric card will not scroll to
the PID if it's already selected. This PR fixes that

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

* **New Features**
* Added a **Root blockers** view to highlight sessions that block
others, with expandable blocking chains revealing related waiting
activity.
* **Bug Fixes**
* Updated blocking metrics to use **transitive** blocker counts and
improved cycle protection and behavior when activity records are
missing.
* The blockers view now consistently affects state/application/role
quantities, and **reset filters** clears the view.
* **Refactor / UI**
* Improved the sessions table wit... (continued)

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