NFR: add custom decorateIcons script for helix v5

Context/Description

In PR #604 we noticed issues with icons. This is reported in #608. After investigation, we concluded that moving to the current version of the decorateIcons script of aem.js is impossible.

Our need of adapting icons to their context is of high importance. Migrating to another technique would mean:

Architectural changes of redesign blocks
Extra development work to cater for this
More work for content editors, due to less automation
More risk of incorrect (brand) color usage

Hence, it has been decided to move to one generic script for Mack Trucks and Volvo Trucks and use that instead of the function in aem.js

Acceptance Criteria

Editor AC:

Applying icons in pages remains unchanged

Non-functional AC:

Create a version of the decorateIcons script with image sprite functionality in common.js
This script will be the same for for all Volvo Group websites

Out of scope

No response

Note

Due to the MT script for loading icons is more efficient, overall performance will be improved. It might be that this change will have a positive impact on #600

Technical details

Copy the code of https://github.com/hlxsites/vg-macktrucks-com/issues/700

Attachment / link to Figma

No response

hlxsites / vg-volvotrucks-us