Exclude additional hubspot domain from Load JavaScript Deferred

[webtrainingwheels]

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Describe the bug
We have an automatic exclusion for Hubspot to resolve an error with Load JS Deferred:

The same script, shell.js can also be loaded from this other domain which should also be excluded:
js-eu1.hsforms.net

To Reproduce
Steps to reproduce the behavior:

1. Add this script to the site:

<script charset="utf-8" type="text/javascript" src="//js-eu1.hsforms.net/forms/shell.js"></script>
<script>
  hbspt.forms.create({
	region: "eu1",
	portalId: "25164403",
	formId: "dfed4d9e-e999-4272-a287-8fabd2e0fdd7"
});
</script>

2. Activate Load JS Deferred
3. You will see this error: hbspt is not defined

Expected behavior
There should be no error.

Additional context
Original issue: #1378
New Ticket: https://secure.helpscout.net/conversation/1725349434/314036?folderId=377611

Backlog Grooming (for WP Media dev team use only)

• Reproduce the problem
• Identify the root cause
• Scope a solution
• Estimate the effort

[Tabrisrp]

Scope a solution ✅

In DeferJS class, add js-eu1.hsforms.net to the $exclude_defer_js array.

Estimate the effort ✅

Effort [XS]