fix: correctly report "skipped" result in TestCase

[sheremet-va]

Description

I'm also wondering if we should remove the skipped state altogether from the result() and only keep pass and fail 🤔

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[sheremet-va]

Decided to introduce the state() method on Suite and Module instead (similar to result() but without the errors): https://github.com/vitest-dev/vitest/pull/7069/files#diff-cd81764fa6513d3cb255c7299d25deeef63f842e17877bfc16ff9a75c783ddf6R356

[sheremet-va]

This is part of #7069