test(rome_cli): add snapshots for file system and console session

[ematipico]

Summary

This PR improves the CLI tests by creating a snapshot. The snapshot will contain:

• the content of the configuration file, if it exists
• the files contained inside the memory file system during the test run of a single test (excluded the configuration file)
• the messages printed by the console, if any (excluded the timing messages)

The reason why I created snapshots it's because I found myself at struggle sometimes, when I needed to test specific cases. Also, there have been few issue before where some messages where not supposed to be there, and I couldn't catch them early. The snapshots, somehow, might help the testing experience a bit.

The snapshot have been added to some existing cases, but not all of them. I had to exclude some runs because of some issue that I couldn't debug (some test stalls for some reason).

Test Plan

The CI should not fail

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Playground for commit 37b3cef

[leops]

I wonder if we could transition the CLI test suite to be fully fixture and snapshot based: each test is a directory containing an fs directory with the initial state of the memory filesystem, an stdin file containing the command line to be run and eventually the console inputs for interactive commands, and the snapshot file with the modified files and console output

[ematipico]

I wonder if we could transition the CLI test suite to be fully fixture and snapshot based: each test is a directory containing an fs directory with the initial state of the memory filesystem, an stdin file containing the command line to be run and eventually the console inputs for interactive commands, and the snapshot file with the modified files and console output

I really like the idea, I think this could work. But I would like to apply this proposal in another PR, because your will make a lot changes. If you're OK with the structure of the snapshots, I think we can merge it?

[leops]

I'm still a bit concerned about why the upgrade_severity test would suddenly start hanging, but I couldn't reproduce the issue locally (I tried to run the test with and without a debugger attached but the issue never manifested). Otherwise the format of the snapshots themselves seems alright to me

[leops]

Nit: wrap the messages in a code block to have them rendered in a <pre> block in markdown previews and respect the line breaks