kobotoolbox / kpi / 19872941554

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feat(exports): only allow one anonymous export at a time DEV-1359 (#6514)

### 📣 Summary
Only create one export at a time for anonymous users.


### 📖 Description
If an anonymous user creates an export and another anonymous user
attempts to create a new export before the other one is finished, they
will receive a 503 error with a message to try again.


### 👀 Preview steps

1. ℹ️ have an account and a project with some submissions
2. Allow anonymous access to the project
3. Open the project anonymously in a private browser window
4. Export the data. Make note of the task uid in the network tab of the
browser console
5. In a django shell, update the created submission task to have
status='processing' and save
6. Request another export
7. 🔴 [on main] Another export is created
8. 🟢 [on PR] A 503 is returned with an error message telling you to try
again later (in network tab, frontend will not yet reflect this)

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