Fix CI

[j616]

Details

Reduce size of video grains generated by hypothesis in tests. This addresses an issue where hypothesis now restricts the size of test data which it generates. Large sizes never actually worked correctly.

Pivotal Story

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Related PRs

Where appropriate. Indicate order to be merged.

Links to external test runs/working deployment

Where appropriate, if separate to default CI run

Submitter PR Checks

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• PR completes task/fixes bug
• Tests exercise code appropriately
• New features and API breaks are flagged in commit messages using magic strings
• Documentation updated (README, Confluence, Docstrings, API spec, Engineering Guide, etc.)
• Downstream repos have been checked for potential breaks & fixed as needed
• APIs/UIs/CLIs updated as required
• PR added to Pivotal story
• Follow-up stories added to Pivotal
• Any temporary code/configuration removed (e.g. test deployment environment, temporary commontooling branch)
• Any pins against pre-releases have been removed

Reviewer PR Checks

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• PR completes task/fixes bug
• Tests exercise code appropriately
• Design makes sense, and fits with our current code base
• Code is easy to follow
• PR size is sensible
• Commit history is sensible and tidy

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[philipnbbc]

Some changes suggested inline. Otherwise LGTM

[philipnbbc]

Oh, it was changed to draft as I reviewed it :-)

[j616]

Fixes made anyway :)