FEAT: Enhance custom extension dialog with display name and validation checks

[eblanco-ansys]

Description

Improve the custom extension dialog by adding a display name field and implementing validation checks to ensure unique and valid names for extensions.

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.21%. Comparing base (68c31d2) to head (c6d24d7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6760      +/-   ##
==========================================
+ Coverage   83.16%   83.21%   +0.05%     
==========================================
  Files         246      246              
  Lines       77493    77458      -35     
==========================================
+ Hits        64444    64457      +13     
+ Misses      13049    13001      -48     

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[SMoraisAnsys]

LGTM, left minor comments