[openstreetmap/openstreetmap-website] Reduce test run time, current improvement: 9.5m to 4.9m (PR #4708)

[Josh Thompson]

> Password hash creation is deliberately slow, to make brute forcing hard

absolutely. In a production environment, we'd want to do the slow and laborious hash creation, but for testing, we don't. 

So, I hard-coded a generated hash (for the tests/factory data), so when setting up 4000 test users, the deliberately slow function is never called, and it saved a ton of time:

https://github.com/openstreetmap/openstreetmap-website/pull/4708/files#diff-3cb894babbd387f02bde8eb4daf7ddb6f0a5207d0562af589dc59a5653092c04R5

I'm still optimistic about a 90% improvement in test run time - I'm aiming for ~1.5 minutes, total. I don't know if I'll get there, but we're trying! :) 

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