fixup! test: expand VFS provider and promises test coverage

Author: mcollina

lib/internal/main/embedding.js

@@ -24,7 +24,6 @@ const { codes: {
   ERR_UNKNOWN_BUILTIN_MODULE,
 } } = require('internal/errors');
 const { pathToFileURL } = require('internal/url');
-const { loadBuiltinModule } = require('internal/modules/helpers');
 const { compileSourceTextModule, SourceTextModuleTypes: { kEmbedder } } = require('internal/modules/esm/utils');
 const { moduleFormats } = internalBinding('modules');
 const assert = require('internal/assert');