test(v6): add runner dynamic import test

[hi-ogawa]

Description

I'm testing alpha.18 hi-ogawa/vite-environment-examples#91 and found that import(/* @vite-ignore */ someAboslutePath) is returning a duplicate module. I added a failing test case in this PR.

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[sheremet-va]

This does seem consistent with how Vite works: Vite server expects the URL, but instead, you pass down the full path. The server says that this module doesn't exist:

environment.moduleGraph.getModuleByUrl('/src/basic.js') // exists
environment.moduleGraph.getModuleByUrl('<root>/src/basic.js') // doesn't exist

There is an inconsistency when you call runner.import directly - it will shorten the path to avoid accidental duplicated modules. So we should either make it fail, or also shorten the path for dynamic imports inside the processed code 🤷🏻

It does seem more like a bug because in Node.js this code will work correctly 🤔

[sheremet-va]

Should be fixed by 01246e5 (#16471)