Ensure clean-up for func tests

[dashmage]

In the test_config_changed_port and test_config_changed_log_level tests, the clean-up steps

await app.reset_config(["exporter-port"])

may not execute in case of a failure in any of the previous lines of code.

In order to fix this, we would need a cleanup phase where even if an error occurs, the cleanup will happen before the test exits.

[dashmage]

The addCleanup method could be used for this purpose if we define the TestCharm as a TestCase.

[Pjack]

The code has changed, and it’s unlikely this issue will be addressed in the future. I’ll close the ticket for now, but feel free to reopen it if anyone wants to enhance this part.

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/SOLENG-995.

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