fix(NcActions): introduce 'size' prop

[Antreesy]

☑️ Resolves

• Allows to pass 'size' prop to underlying NcButton components
• Introducing beforehand, if that would be ever required by apps

🖼️ Screenshots

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable
• 2️⃣ Backport to stable8 for maintained Vue 2 version or not applicable

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.75%. Comparing base (dd4ff45) to head (872c49a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7847      +/-   ##
==========================================
+ Coverage   51.72%   51.75%   +0.03%     
==========================================
  Files          98       98              
  Lines        3167     3169       +2     
  Branches      872      872              
==========================================
+ Hits         1638     1640       +2     
  Misses       1279     1279              
  Partials      250      250              

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[ShGKme]

/backport to stable8