feat: add AEM embed support for header/footer and embed-tester tool

[davidnuescheler]

Test URLs:

• https://feat-aem-embed-header-footer--vitamix--aemsites.aem.network/tools/embed-tester/embed-tester.html

[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

• 802e83f ✅ (latest)
• ce4437f ✅
• 246d1bc ✅
• 965fabf ✅
• b738659 ✅
• d57917a ✅
• a94a0ac ✅
• 86ce0ec ✅
• 48ac2b7 ✅

[aem-code-sync]

	Page	Scores	Audits	Google
📱	/tools/embed-tester/embed-tester.html
🖥️	/tools/embed-tester/embed-tester.html