fix: change iterdir() for rglob('*')

[RobPasMue]

Description

Instead of iterating the top-level of the directory, let's retrieve all files and upload them directly.

Issue linked

Closes #2099

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 unit tests.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have added the minimum version decorator to any new backend method implemented.
• I have made sure that the title of my PR follows Conventional commits style (e.g. feat: extrude circle to cylinder)

[RobPasMue]

@syscordan - could you give it a try whenever you have the chance and see if it fixes your issues reported in #2099 ?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.48%. Comparing base (bfa184d) to head (d8b6a8e).

Files with missing lines	Patch %	Lines
src/ansys/geometry/core/modeler.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2101      +/-   ##
==========================================
- Coverage   93.50%   93.48%   -0.02%     
==========================================
  Files         138      138              
  Lines       10156    10156              
==========================================
- Hits         9496     9494       -2     
- Misses        660      662       +2     

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