RFC - Test modules with issues regarding strict and warnings

[perlpunk]

🧹 I'm building a tool to run test modules with strict and warnings and check if they compile. I want to add it as a github action at some point.

⚠️ IMPORTANT: The commits I made are in most cases just cheap fixes to make strict happy. They will need a proper fix instead.

👓 Please look through the commits and see if you can fix some of them. I will then continuously rebase this PR until hopefully all issues are solved.

• This is just a first step to get rid of issues with strict.
• There will be more issues coming regarding warnings.
• Note that I think these are not often only issues with strict, but I think those tests cannot work correctly.
  In the future when we enforce strict and warnings, we can avoid such broken tests.

• Related ticket: https://progress.opensuse.org/issues/194002

Thanks! 🙏

[mpagot]

#24710

[perlpunk]

So I was able to remove some commits by rebasing, but unfortunately I had to add more commits with new errors.
I'll try to provide a script soon that you can use to check locally.