feat(custom-element): new es build module

[ariellalgilmore]

Closes carbon-design-system/carbon#18761

creates a new es-custom folder which will generate our components with cds-custom- prefix instead of cds-

Changelog

New

• updated build to add a post build which copies the generates es files and then does a find and replace to swap out all instances of cds with cds-custom
• add es-custom to gitignore

Testing / Reviewing

run yarn build and see if es-custom folder is generated in web components and if the components have the correct prefix

note

• User's will need to import two different style files. One with

@use '@carbon/styles' with (
  $prefix: 'cds-custom' // Default prefix
);

and the other will be just

@use '@carbon/styles' 

• Also, they need to set in their tsconfig files if using an angular version before angular 19 to

"skipLibCheck": true

[netlify]

✅ Deploy Preview for ibm-products-web-components ready!

Name	Link
🔨 Latest commit	5c2aae9
🔍 Latest deploy log	https://app.netlify.com/sites/ibm-products-web-components/deploys/67c77a244171cd00080bd2f7
😎 Deploy Preview	https://deploy-preview-7031--ibm-products-web-components.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[netlify]

✅ Deploy Preview for carbon-for-ibm-products ready!

Name	Link
🔨 Latest commit	5c2aae9
🔍 Latest deploy log	https://app.netlify.com/sites/carbon-for-ibm-products/deploys/67c77a240590110008a63bde
😎 Deploy Preview	https://deploy-preview-7031--carbon-for-ibm-products.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.70%. Comparing base (73a0d2f) to head (5c2aae9).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7031      +/-   ##
==========================================
- Coverage   81.73%   81.70%   -0.03%     
==========================================
  Files         401      401              
  Lines       13022    13022              
  Branches     4289     4289              
==========================================
- Hits        10643    10640       -3     
- Misses       2379     2382       +3     

Components	Coverage Δ
ibm-products	∅ <ø> (∅)
ibm-products-web-components	∅ <ø> (∅)

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.