Tests fail in CI with error `Error: ENOSPC: no space left on device, write`

> Huh, now they are failing with:
>
> ```
> ❯ unit (chromium) src/room/timeline/event-tile/body/MediaBody/MediaBody.test.tsx (0 test)
>
> ⎯⎯⎯⎯ Unhandled Rejection ⎯⎯⎯⎯⎯
> Error: ENOSPC: no space left on device, write
> ❯ write node:internal/fs/promises:745:8
> ❯ writeFileHandle node:internal/fs/promises:502:7
>
> ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
> Serialized Error: { errno: -28, code: 'ENOSPC', syscall: 'write' }
> ```
>
> I wonder if that is related.

_Originally posted by @richvdh in [#33189](https://github.com/element-hq/element-web/issues/33189#issuecomment-4268622771)_

Start with the CI run and the reported unit test in src/room/timeline/event-tile/body/MediaBody/MediaBody.test.tsx. Investigate why the Chromium test run reaches ENOSPC while writing, and consider the work complete when the affected CI tests run without the no-space error.

Written by the indexing model from the issue text.