✅ Make unit tests working again + Bump package_info_plus dep

[istornz]

What does this PR do?

• Rework unit tests to make it works again.
• Upgrade package_info_plus dep to 5.0.1 (as is blocking on some project depending on it)

⚠️ I think I found a bug in the SDK, if someone could check if it's voluntary or not: In the query_test.dart file, line 86. I think the correct behavior is to return a simple list ['a', 'b', 'c'] like others but actually it return [['a', 'b', 'c']].

Test Plan

• Run flutter test

Related PRs and Issues

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[istornz]

Closed, I would contribute in the SDK generator instead.