chore(agnostic): Remove use of util.promisify (#6446)

In `src/common` we now use `fs.promises.X` which we can dynamically
`import`. In a browser environment this code will never run because it's
gated on `isNode` (in a future PR we will add tree-shaking to the bundle
step such that this code is eliminated). By using `import`, we ensure
TypeScript still can track types and give good type information.

In `src/node` we continue to use `util.promisify` but that's not a
concern as that code explicitly is never run in the browser.

test/tsconfig.test.json

@@ -1,3 +1,6 @@
 {
   "extends": "../tsconfig.base.json",
+  "compilerOptions": {
+    "module": "CommonJS"
+  }
 }