Add card stack count

[Incogdino]

What is the purpose of this pull request?

• Documentation update
• Bug fix
• Feature addition or enhancement
• Code maintenance
• DevOps
• Improve developer experience
• Others, please explain:

Closes #2808

Overview of changes:
Add count for the number of cards displayed on the card stack.

Anything you'd like to highlight/discuss:

Testing instructions:
npm run test

Proposed commit message: (wrap lines at 72 characters)
Add count to card stack component

---

Checklist: ☑️

• Updated the documentation for feature additions and enhancements
• Added tests for bug fixes or features
• Linked all related issues
• No unrelated changes

---

Reviewer checklist:

Indicate the SEMVER impact of the PR:

• Major (when you make incompatible API changes)
• Minor (when you add functionality in a backward compatible manner)
• Patch (when you make backward compatible bug fixes)

At the end of the review, please label the PR with the appropriate label: r.Major, r.Minor, r.Patch.

Breaking change release note preparation (if applicable):

• To be included in the release note for any feature that is made obsolete/breaking

Give a brief explanation note about:

• what was the old feature that was made obsolete
• any replacement feature (if any), and
• how the author should modify his website to migrate from the old feature to the replacement feature (if possible).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.86%. Comparing base (b956547) to head (cf47d4a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2817   +/-   ##
=======================================
  Coverage   71.85%   71.86%           
=======================================
  Files         134      134           
  Lines        7340     7342    +2     
  Branches     1565     1503   -62     
=======================================
+ Hits         5274     5276    +2     
- Misses       1938     2020   +82     
+ Partials      128       46   -82     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 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.

[gerteck]

Opps, I think that what I meant in the issue was beside the tags (e.g. Success (2) [ ] , Perservence (2) [ ])

Let me know if you think that owuld be a good idea!