feat: Optimize db evaluation

[fsbraun]

Description

This PR halves the number of queries needed for the page tree's state indicator. This improves responsiveness of the page tree.

It also reduces the number of DB queries when populating the toolbar.

Related resources

• Based on an analysis using kolo by @wilhelmklopp and @LilyFoote
• #...

Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines and I have joined #workgroup-pr-review on
  Slack to find a “pr review buddy” who is going to review my pull request.

[marksweb]

Where changes being lower db hits its useful to add tests that assert the number of queries made so we can avoid regression.

[fsbraun]

@marksweb Indeed. I added a test that ensures one query by indicator.