integration tests are not detecting failures in the workload, leading to false ✔️ in CI

[ca-scribner]

Bug Description

As described in #126, this charm's CI has been showing as working (eg: ✔️ ) even though the workload is not deploying properly. This led to us at some point in the past breaking the charm without noticing, and then catching it when it blocked a few unrelated efforts.

We should fix this CI, as well as any root causes for why it doesn't work (likely we need to address #82 as well, because sometimes the workload is up but not healthy).

To Reproduce

See #126.

Environment

Relevant Log Output

-

Additional Context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5229.

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[orfeas-k]

In order to test the health check described in #82 (comment), implement the following logic:

1. misconfigure the workload in order for the service to not replying successfully and the workload health check to be failing
2. Then either:
   i. Wait 40 seconds which are the seconds that the health needs to be set to down (threshold * (period + timeout)). Then, fire an update-status in order to verify that the charm's status will reflect the workload's status
   ii. Configure model to fire update-status every 10 seconds using fast-forward and assert that the charm status is maintenace with a proper timeout. This can be done either like this or this.