chore(webpack, web): add saslprep no-op alias for webpack bundle web

[Anemy]

We're hitting the 10mb limit for the bundle:

compass/packages/compass-web/webpack.config.js

Lines 18 to 23 in 5421da4

	/**
	* Atlas Cloud uses in-flight compression that doesn't compress anything that is
	* bigger than 10MB, we want to make sure that compass-web assets stay under the
	* limit so that they are compressed when served
	*/
	const MAX_COMPRESSION_FILE_SIZE = 10_000_000;

These changes bring the size back down a bit. npm run analyze in the compass-web package for webpack analysis.

Related slack thread https://mongodb.slack.com/archives/G2L10JAV7/p1746808113154329

[nbbeeken]

LGTM as is, suggestion about the export

[Anemy]

I need to look into the test that's failing. Might be that our testing is using connection strings that use this. I'm thinking we might want to more explicitly throw here when the polyfill is used with a message indicating it's not supported and why.

[gribnoysup]

Please don't skip those, most of our web tests will use the user-pass based auth, let's rather exclude sasl prep only for published bundle, and not for one that will be compiled for tests

[Anemy]

Good call. Updated the webpack to only run on production with the comment.

[Anemy]

Merged to unblock compass-web package bundling size restriction so we can release new versions of that. @gribnoysup if the changes don't make sense feel free to revert, or I can make a follow up pr.