monaco-editor 0.56.0 (bumped in #7897) ships a restrictive `exports` map
("./*.js" -> "./esm/vs/*.js", "./*" -> "./esm/vs/*.js") that rewrites every
subpath by prepending esm/vs/. The pre-0.56 deep import
`monaco-editor/esm/vs/editor/editor.api` therefore resolved to the doubled,
non-existent `esm/vs/esm/vs/editor/editor.api.js` and broke the production
Turbopack build (Module not found in MonacoEditor.tsx).
Switch to the 0.56-compatible specifier `monaco-editor/editor/editor.api.js`,
which resolves to the same file (esm/vs/editor/editor.api.js) as before.
Adds tests/unit/monaco-editor-import-path.test.ts as a regression guard:
asserts the specifier has no esm/vs/ prefix and resolves to editor.api.js
against the installed monaco 0.56.
