Create an onReady and onError callback for standalone gnav

[bandana147]

• Adds an onReady callback that will be triggered when Gnav loads
• Adds an onError callback that will be triggered if any error occurs inside gnav

Resolves: MWPW-158168

Test URLs:

• Before: https://main--milo--adobecom.hlx.page/?martech=off
• After: https://gnav-event--milo--adobecom.hlx.page/?martech=off

Qa: https://adobecom.github.io/nav-consumer/navigation.html?authoringpath=/federal/dev&env=stage&navbranch=gnav-event

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Commits

• 566e139 ✅ (latest)
• ab543fe ✅
• a7f1c7e ✅
• 039fa9b ✅
• 15b77cf ✅
• 85eef7e ✅
• 705ea10 ✅
• 70a6178 ✅
• f7c5aff ✅
• 5f2c113 ✅
• 896d027 ✅
• e528288 ✅
• fa0a94e ✅
• c69e20d ✅

[aem-code-sync]

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

[codecov]

Codecov Report

Attention: Patch coverage is 89.09091% with 6 lines in your changes missing coverage. Please review.

Project coverage is 96.24%. Comparing base (c80cf18) to head (566e139).
Report is 1 commits behind head on stage.

Files with missing lines	Patch %	Lines
libs/utils/utils.js	45.45%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            stage    #2873      +/-   ##
==========================================
- Coverage   96.24%   96.24%   -0.01%     
==========================================
  Files         236      236              
  Lines       54253    54273      +20     
==========================================
+ Hits        52216    52234      +18     
- Misses       2037     2039       +2     

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[mokimo]

Suggested change

	window.dispatchEvent(new CustomEvent('feds:nav.ready'));
	window.dispatchEvent(new CustomEvent('feds:nav:ready'));

[mokimo]

On another note, since it's a milo block, should we dispatch milo:globalnav:ready ? That follows the other eventlisteners such as milo:modal:closed within the ecosystem

[mokimo]

As a more general question, why is that needed and what is the use-case? The ticket and description don't mention anything

[bandana147]

As a more general question, why is that needed and what is the use-case? The ticket and description don't mention anything

@mokimo This is currently required for the Adobe Home team, but we thought it would be a good use case to support as a standalone component. They want to display a loader state until the Gnav fully loads and be able to handle/track any errors that occur within their app.

[github-actions]

This pull request is not passing all required checks. Please see this discussion for information on how to get all checks passing. Inconsistent checks can be manually retried. If a test absolutely can not pass for a good reason, please add a comment with an explanation to the PR.

[bandana147]

@narcis-radu @mokimo Could you please review the updated changes?