fix(md5-js): call fromUtf8 from correct environment

[trivikr]

Issue

Fixes: #2640

Description

Calls fromUtf8 from correct environment in md5-js

Testing

Added console.log as follows:

packages/util-utf8-browser/src/index.ts

 declare const TextDecoder: Function | undefined;
 declare const TextEncoder: Function | undefined;
 
-export const fromUtf8 = (input: string): Uint8Array =>
-  typeof TextEncoder === "function" ? textEncoderFromUtf8(input) : jsFromUtf8(input);
+export const fromUtf8 = (input: string): Uint8Array => {
+  console.log("util-utf8-browser");
+  return typeof TextEncoder === "function" ? textEncoderFromUtf8(input) : jsFromUtf8(input);
+};
 
 export const toUtf8 = (input: Uint8Array): string =>
   typeof TextDecoder === "function" ? textEncoderToUtf8(input) : jsToUtf8(input);

packages/util-utf8-node/src/index.ts

 import { fromArrayBuffer, fromString } from "@aws-sdk/util-buffer-from";
 
 export const fromUtf8 = (input: string): Uint8Array => {
+  console.log("util-utf8-node");
   const buf = fromString(input, "utf8");
   return new Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength / Uint8Array.BYTES_PER_ELEMENT);
 };

Test code

// test.js
import { Md5 } from "../aws-sdk-js-v3/packages/md5-js/dist/cjs/index.js";

const hash = new Md5();
hash.update("test");
console.log(btoa(String.fromCharCode.apply(null, await hash.digest())));

Node.js

$ node test.js
util-utf8-node
CY9rzUYh03PK3k6DJie09g==

Browser

Created bundle using webpack

$ webpack --version
webpack 5.48.0
webpack-cli 4.7.2

$ webpack ./test.js

Copied code from dist/main.js and pasted it in browser.
Verified that the following was printed in console:

util-utf8-browser
CY9rzUYh03PK3k6DJie09g==

---

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• CodeBuild project: sdk-staging-test
• Commit ID: a4598bc
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