Stop patching the private ops.testing._TestingModelBackend class

[tonyandrewmeyer]

Context

As _TestingModelBackend is a private class, no guarantees are made about compatibility, and the tests relying on patching this class will break in an upcoming ops release.

The patching is actually no longer required with recent versions of ops, so mostly the patching can just be removed, with the occasional add_network call potentially required.

What needs to get done

Remove the patching of _TestingModelBackend.

You can use these PRs as examples if needed:

• prometheus-k8s
• grafana-k8s
• postgresql
• postgresql-k8s
• mysql

If any assistance is required, please reach out to @canonical/charm-tech and we'll be happy to help!

Definition of Done

No private ops classes are patched.

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-6255.

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