Resolve "Package graphql api: improve sorting tests"

What does this MR do and why?

Resolves #328793

• Refactored sorting and pagination tests
  • refactored fields for package fixtures, so it will have a different order for every test case
  • explicitly defined expected order

I also added commits below, I can remove them if they make it harder to use git blame in the future.

• rename variable package to npm_package as it's more explicit
• fixed typo versionaless_package
• fixed alignment issue with fields variable

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.

Related to #328793