Ambient-Mode Integration Tests Pass on Paths Not Found

[MattiaSarti]

Bug Description

Integration tests asserting path pages exist pass even when such paths don't exist, as detailed in #323.

To Reproduce

See this pull request and its CI runs.

Environment

See this pull request and its CI runs.

Relevant Log Output

See [this pull request](https://github.com/canonical/kubeflow-dashboard-operator/pull/323) and its CI runs.

Additional Context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-8600.

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