fix: resolve directory correctly when fs.cachedChecks: true

[sapphi-red]

Description

I checked this with #15858 and #15901.

fixes #15858
fixes #15901
refs #15279

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[patak-dev]

Oh, amazing! Thanks for digging into this @sapphi-red. Let's merge it and release a patch. Maybe we could extract this as an util and apply it when we normalize paths in the config too? I was under the impression that the normalized path will not have the trailing / and I think we have some paths expecting that

[sapphi-red]

Yeah, maybe we can apply it in normalizePath.