MWPW-158484: Round 1 Blog Performance Improvements

[JasonHowellSlavin]

• Deletes unnecessary utils.js and moves code to scripts.js
• Adds preload scripts to head.html for milo styles and utils
• Modifies tests to use new-ish libs pattern

Resolves: MWPW-158484

Test URLs:

• Before: https://main--bacom-blog--adobecom.hlx.page/?martech=off
• After: https://performance-improvements--bacom-blog--adobecom.hlx.page/?martech=off

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed.
In case there are problems, just click a checkbox below to rerun the respective action.

• Re-run PSI checks
• Re-sync branch

Commits

• afb78d3 ✅ (latest)
• 4368af3 ✅
• 3984c09 ✅
• 2e93f6e ✅
• 7269f66 ✅
• 0b86cc0 ✅
• 9311856 ✅
• 6897163 ✅
• 86dae99 ✅
• 80d4d2b ✅

[aem-code-sync]

	Page	Scores	Audits	Google
📱	/?martech=off
🖥️	/?martech=off