Typesafety: Fix vite-node resolution in TS plugin

[markdalgleish]

Note, this is a PR to #12019.

Within the context of the TS plugin running within my editor, the root directory of the vite-node server was "/" rather than the project directory.

It looks like this is because it was defaulting to the current working directory, which is different in a TS plugin context compared to regular Vite / CLI usage. If I log process.cwd() within the TS plugin, I get "/".

The fix was to explicitly pass our resolved root directory to vite-node rather than relying on cwd by default.

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Latest commit: 72a20c3

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