Fixed flakiness of a test by adding a clean-up step at the end.

[elland]

As the code comment hints at, we have a very narrow window between a user being created and the account being suspended inside the test environment. For a good reason too. We don't want to run a test that takes too long to check that account suspension works. But a suspended account can no longer be updated, rendering this particular test flaky, especially on subsequent test suite runs.

This should address that issue but immediately cleaning up after itself.

Checklist

• The PR Title explains the impact of the change.
• The PR description provides context as to why the change should occur and what the code contributes to that effect. This could also be a link to a JIRA ticket or a Github issue, if there is one.

[battermann]

looks good
it's a really small change, but I think we still want a changelog entry

[mdimjasevic]

Today I noticed the same test being flaky so thank you for taking care of it, @elland !