Update multiple bulk quick add modals for parity throughout multiple sections

[cfxd]

PR Summary:

Fixes multiple bulk quick add modals on the same page not updating properly

Why are these changes introduced?

Problem demo @

multi-quick-add-modal.mp4

When multiple sections each contain the same product, only the first quick add modal updates because the current script relies heavily on element IDs

What approach did you take?

Introduced a way to update multiple elements

Testing steps/scenarios

• Create a new manual collection and add only one variant product
• Customize the collection template by setting the Product grid section "Quick add" option to "Bulk"
• Add a new Featured collection section to the collection template and select the newly created manual collection as this new section's collection, also set the new section's "Quick add" option to "Bulk"
• (Optional) duplicate the new Featured collection section as many times as you like
• Add/remove products as desired to the various bulk quick add modals and you'll notice that only the first one on the page is updated accurately because of the update script's reliance on element IDs

Demo links

• Store password: infinite

Checklist

• [√] Added PR summary for release notes
• [√] Followed theme code principles
• [√] Linted with Theme Check
• [√] Tested on mobile
• [√] Tested on multiple browsers