Clean up and test placeholders

[cogniSyb]

Sometimes placeholders are missing or removed. This needs to be flagged. Some placeholders aren’t in use. We need to remove them.

A new function was added, getPlaceholders in https://github.com/hlxsites/vg-volvotrucks-us/commit/50d802b1493017e003c005e06ce707847c2fe0df and https://github.com/hlxsites/vg-macktrucks-com/commit/592f3e04b3a903eabecab5b0f012bf9f0adb2ed3.

See https://projects.netcentric.biz/wiki/pages/viewpage.action?pageId=495752915#Frontendchangesinaem.js/helixv5-VTfetchPlaceholders as well

https://www.aem.live/developer/placeholders

Requirements

• Remove unused placeholders

• Create a test to make sure we don’t have missing items

• Placeholders need to follow a naming structure

• Refactor code and use standard AEM functionality

• [ ] Define placeholder naming structure. Examples of inconsistencies: "recall_date", "READ NOW", "Search For", "no results", "event-notify:first-name"

• [ ] Figure out how we should deal with multilingual solutions; AEM code is prepared for it, but

[BeckyMedlin]

@shirin27 The milestones for this ticket are incorrect.

[shirin27]

@BeckyMedlin added the Volvo Refactoring milestone, I think this would be the right one.

[BeckyMedlin]

@cogniSyb Should all of this be done dynamically? Is there a possibility of dynamic updates causing an issue? We can discuss in refinement if needed.