Fix: cancel possibly slow queries on doc details

[shamoon]

Proposed change

This issue seems most noticeable on suggestions which can be very slow on some machines. The fix is simple (and probably should have been written this way from the start), just cancel queries when e.g. navigating away. Video demonstrates this (for testing I added time.sleep(60) into the suggestions view), without these changes the requests remain pending.

Fixes #3715

unsubscribe.mov

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain):

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[alexgrahamuk]

Fantastic fix 😁

[github-actions]

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