MWPW-154060: Preload most used scripts in head.html

[JasonHowellSlavin]

• Adds the setlibs function and some code in a script tag in the head to preload assets for the pages to increase loading speed.

Resolves: MWPW-154060

Test URLs:

• Before: https://main--bacom--adobecom.hlx.live/?martech=off
• After: https://head-prefetch-test--bacom--adobecom.hlx.live/?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
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Commits

• 74c9a11 ✅ (latest)
• a4fd40a ✅
• 60ce029 ✅
• 5aff88a ✅
• 8bb100e ✅
• fbed148 ✅
• dd0c6b5 ✅
• 8c1629f ✅
• 6a46c95 ✅
• 0ea5679 ❌

[aem-code-sync]

	Page	Scores	Audits	Google
M	/?martech=off
D	/?martech=off

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.95%. Comparing base (97475e6) to head (74c9a11).

Additional details and impacted files

@@           Coverage Diff           @@
##            stage     #240   +/-   ##
=======================================
  Coverage   95.95%   95.95%           
=======================================
  Files          11       11           
  Lines        1088     1088           
=======================================
  Hits         1044     1044           
  Misses         44       44           

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[meganthecoder]

I'm seeing these warnings because of the way you're injecting the hrefs. Are we just ignoring them?

It creates some noise in the console, so maybe it would be better to build the elements with javascript.

[JasonHowellSlavin]

I'm seeing these warnings because of the way you're injecting the hrefs. Are we just ignoring them?

It creates some noise in the console, so maybe it would be better to build the elements with javascript.

Good point. I was trying to keep the JS as small as possible, but we don't want to jam up the console. Please take another look.