test: remove additional fake timer

[WikiRik]

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Description Of Change

#14390 is currently failing due to sinonjs/fake-timers#426
This should solve it. I did update the Model upsert works when two separate uniqueKeys are passed test to remove the timing check since that is not part of what is being tested.

As a future refactor we should look into the usage of fakeTimers and see if they are not used too often

[github-actions]

🎉 This PR is included in version 7.0.0-alpha.12 🎉

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