feat(flagd): use test-harness version number for integration tests

[aepfli]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.25%. Comparing base (41d0ad8) to head (c87fd7a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #120   +/-   ##
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  Coverage   94.25%   94.25%           
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  Files          14       14           
  Lines         731      731           
=======================================
  Hits          689      689           
  Misses         42       42           

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[gruebel]

are the failing tests related to the upgrade to version 0.5.18?

[aepfli]

are the failing tests related to the upgrade to version 0.5.18?

It seems like there is something flaky here. I'll check, but I am already working on a different approach for tests with an unstable connection. We don't need an image that is regularly disconnecting, as we're using test containers; we can just kill the container and be faster with our tests. Additionally this should grant us more stability in the tests, as we're in control