fix: updated get_stackup_props() to have improveStackupModelEnabled in the response

[ansnfernand]

Description

fix: updated get_stackup_props() to have improveStackupModelEnabled in the response

Issue linked

#668

Checklist:

• Run unit tests and make sure they all pass
  - Run tests without Sherlock running
  - Run tests with Sherlock GRPC connection
• Check and fix style errors
  - pre-commit command line check
  - Problems tab in PyCharm
• Bench test new/modified APIs by using and modifying the code in the example for the API method
• Add new classes to rst files, located at: \doc\source\api
• Generate documentation
• Verify the HTML. It gets generated at: \doc\build\html.
  - Open index.html
  - Click on "API Reference" at the top.
  - Verify HTML for API changes.
• Check that test code coverage is at least 80% when Sherlock is running
• Check vulnerabilities locally
• Make sure that the title of the pull request follows Commit naming conventions (e.g. feat: adding new PySherlock command)

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 62.99%. Comparing base (45f79fc) to head (906c48d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ansys/sherlock/core/types/stackup_types.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #669      +/-   ##
==========================================
- Coverage   63.00%   62.99%   -0.02%     
==========================================
  Files          22       22              
  Lines        6196     6197       +1     
==========================================
  Hits         3904     3904              
- Misses       2292     2293       +1     

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