docs: Example on modeling solidification

[MohammedAnsys]

End-to-end PyFluent workflow on modeling solidification

1. ANSYS Fluent User's Guide, ANSYS, Inc.

2. Modeling solidification

The example tries to follow the provided guidelines with #4378 and uses the new API implementation.

Thanks.

[Copilot]

Pull Request Overview

This PR introduces a comprehensive end-to-end PyFluent workflow example demonstrating modeling of solidification in a Czochralski crystal growth process. The example follows established guidelines and showcases the new API implementation for setting up complex multi-physics simulations.

• Implements a complete solidification modeling workflow with phase change behavior
• Demonstrates advanced features including Marangoni convection, pull velocities, and custom field functions
• Integrates the example into documentation and CI pipeline for automated testing

Reviewed Changes

Copilot reviewed 3 out of 9 changed files in this pull request and generated 2 comments.

File	Description
examples/00-fluent/Modeling_solidification_workflow.py	Complete solidification modeling example with 2D axisymmetric swirl configuration
doc/source/conf.py	Adds new example to Sphinx gallery pattern for documentation generation
.github/workflows/execute-examples-weekly.yml	Includes new example in weekly CI execution workflow

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