fix: update import paths and add verification files to examples

[germa89]

Description

As the title.

Issue linked

Extracted from #1300

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• 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 marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

Summary by Sourcery

Fix import path resolution in examples and expand the examples module with verification file references

Bug Fixes:

• Rename examples module path variable from dir_path to __dir_path for consistent import resolution

Enhancements:

• Import verification file mapping and expose multiple vm examples in ansys.mapdl.core.examples

[ansys-reviewer-bot]

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[sourcery-ai]

Reviewer's Guide

This PR refactors how example file paths are resolved by updating the module‐level path variable and integrates a suite of verification input files by importing them and exposing each as a top‐level example variable.

Class diagram for updated examples module structure

classDiagram
    class examples.py {
        - __dir_path: str
        - wing_model: str
        + laterally_loaded_tapered_support_structure
        + pinched_cylinder
        + transient_thermal_stress_in_a_cylinder
        + elongation_of_a_solid_bar
        + natural_frequency_of_a_piezoelectric_transducer
        + frequency_response_of_electrical_input_admittance
        + electrothermal_microactuator_analysis
        + piezoelectric_rectangular_strip_under_pure_bending_load
        + transient_response_of_a_ball_impacting_a_flexible_surface
        + threed_nonaxisymmetric_vibration_of_a_stretched_membrane
        + modal_analysis_of_a_cyclic_symmetric_annular_plate
    }
    class vmfiles {
        + ["vm5"]
        + ["vm6"]
        + ["vm33"]
        + ["vm37"]
        + ["vm175"]
        + ["vm176"]
        + ["vm223"]
        + ["vm231"]
        + ["vm65"]
        + ["vm155"]
        + ["vm244"]
    }
    examples.py ..> vmfiles : imports and exposes verification files

Loading

File-Level Changes

Change	Details	Files
Refactor example path resolution variable	Renamed module-level path variable from dir_path to __dir_path Updated wing_model to reference __dir_path	src/ansys/mapdl/core/examples/examples.py
Integrate verification files into examples	Imported vmfiles mapping from ansys.mapdl.core.examples.verif_files Added multiple example variables referencing entries in the vmfiles mapping	src/ansys/mapdl/core/examples/examples.py

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[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬

[sourcery-ai]

Hey @germa89 - I've reviewed your changes and they look great!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.13%. Comparing base (53ad87c) to head (3492605).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4038      +/-   ##
==========================================
+ Coverage   89.05%   89.13%   +0.08%     
==========================================
  Files         187      187              
  Lines       14970    14983      +13     
==========================================
+ Hits        13331    13355      +24     
+ Misses       1639     1628      -11     

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