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 72.20%. Comparing base (41b471d) to head (5e4089c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2817      +/-   ##
==========================================
+ Coverage   72.18%   72.20%   +0.01%     
==========================================
  Files         134      134              
  Lines        7449     7454       +5     
  Branches     1622     1588      -34     
==========================================
+ Hits         5377     5382       +5     
  Misses       2026     2026              
  Partials       46       46              

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[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!

[damithc]

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!

Perhaps we do both i.e., show per-tag total and selected total ?

[yihao03]

I thought showing the total cards count is cool too. In that case I will attempt to take up showing per tag total

[gerteck]

LGTM

[github-actions]

@gerteck Each PR must have a SEMVER impact label, please remember to label the PR properly.