MWPW-168334 Load georoutingv2.json and georoutingv2.js in parallel

[sharmrj]

• Load georoutingv2.json and georoutingv2.js in parallel
• slightly refactored the logic for the failover
• return early when using old georouting to avoid an error where the body of the response gets read twice (response bodies can only be read once)
• This will need to be merged before MWPW-167716 Remove await from both gnav and georouting #3680

Before:

After:

Measurement done on slow 4G.

Resolves: MWPW-168334

Test URLs:

• Before: https://main--milo--adobecom.aem.page/?martech=off
• After: https://optimize-georouting--milo--adobecom.aem.page/?martech=off

https://main--cc--adobecom.hlx.page?milolibs=optimize-georouting

[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

• 1e83df7 ✅ (latest)
• 4629c38 ✅
• 5312882 ✅
• 8fe636d ✅

[aem-code-sync]

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

[afmicka]

@sharmrj Could you please update with the latest stage? Looks like there might not be all updated, causing Nala tests to fail. The new changes merged with the new train are not rendering on this branch
cc: @skumar09