[openstreetmap/openstreetmap-website] Coveralls builds show incorrect coverage (Issue #4043)

[Andy Allan]

Something strange is going on with the Coverage CI tests. The individual jobs are failing, even though the overall coverage is fine:

![Screenshot from 2023-05-24 15-32-40](https://github.com/openstreetmap/openstreetmap-website/assets/360803/1d705911-e207-4d09-a33a-7bef13e99495)

If we dig into a build (e.g. https://coveralls.io/jobs/121929517), we can see the individual jobs have duplicate files, each with different counts for the coverage:

![Screenshot from 2023-05-24 15-51-32](https://github.com/openstreetmap/openstreetmap-website/assets/360803/23123a1b-6327-4c3a-817a-590204653cc9)


The most recent successful build was for https://github.com/openstreetmap/openstreetmap-website/commit/4a786a5e6e7f187a0f4740df53e3032caed688d3 (April 4th) https://coveralls.io/builds/58564512 and it doesn't show the duplicate files:

![Screenshot from 2023-05-24 15-48-17](https://github.com/openstreetmap/openstreetmap-website/assets/360803/c416919f-bac7-4db6-a0cd-271d4e4153e8)


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