[Bug] JSON parse error when switching page quickly

Description

Adresses https://github.com/McK-Internal/vizro-internal/issues/659. This PR shows that the mentioned issue also occurs in a pure dash app.

To reprduce, run hatch run example, load page and immediate navigate away from home page. The same error as in the issue mentioned will appear in the console.

Given that this is not an issue many users will face, and given that it has only occured in integration tests, I would propose we shelve, but not close this issue.

@Joseph-Perkins How do you want to deal with issues that we are real, want to keep track of, but do not want to work on. Presumably the tag Won't fix will suffice?

After we decide this, I will close this PR

Screenshot

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mckinsey / vizro