test: remove type in errors

[9romise]

Related:

• https://eslint.org/blog/2025/10/whats-coming-in-eslint-10.0.0/#removal-of-type-property-in-errors-of-invalid-ruletester-cases
• Change Request: Remove LintMessage#nodeType and TestCaseError#type eslint/eslint#19029
• Allow ESLint v10 alpha as peer dependency #2962

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[FloEdelmann]

FYI: Lint errors fixed in #2981, so I updated your branch with that.

[9romise]

Just a heads-up: there are other test cases in the repository aren’t verifying the location info.

[FloEdelmann]

Thank you! 🙂

Just a heads-up: there are other test cases in the repository aren’t verifying the location info.

Yeah, I know. I just didn't want to make the tests weaker by removing type and not adding location. Ideally we'd add the location everywhere but that's clearly out of scope for this PR 😅