fix: Fix iteration counts breaking personal API keys

[webjunkie]

Problem

API keys issued with a different number of iterations are not getting validated due to hash mismatches.

Changes

• hard-code iteration counts to decouple from Django
• use our main count, if that doesn't work use a fallback one
  • take care to only hash when necessary

How did you test this code?

• generated a key with our regular master and another one with the Django 4 commit
• see that both keys work (they don't on master)

[benjackwhite]

This could really do with a test tbh. If it is not possible then rather merge but if it is doable, lets add it now so it doesn't bite us in the future...

[webjunkie]

I added tests for the new iteration count and also with a hardcoded key as if a customer would have it.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ OperationalError: server closed the connection unexpectedly /api/feature_flag/local_evaluation/ View Issue

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