feat: Add abstract suffixes to resolve class name conflicts

[tefra]

📒 Description

The rename duplicate classes handler is adding numeric suffixes to resolve all conflicts. It's a common practice two elements to share the same name slug but one of them is marked as abstract. The handler should add the abstract suffix in that case and skip the numeric suffixes.

Resolves #983

🔗 What I've Done

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💬 Comments

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🛫 Checklist

• Updated docs
• Added unit-tests
• Sample tests pass
• W3C tests pass

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.95%. Comparing base (fb6a692) to head (7e17539).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #985   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files         115      115           
  Lines        9034     9043    +9     
  Branches     2145     2147    +2     
=======================================
+ Hits         9030     9039    +9     
  Misses          2        2           
  Partials        2        2           

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