[🐛 BUG] on_action function is not valid after downloading in case of a multi-pages apllication

[dataxcount]

What went wrong? 🤔

This provided example https://github.com/Avaiga/taipy/blob/release/4.0/doc/gui/examples/controls/file_download_dynamic_temp_file.py works well in this simple case : clean_up function (on_action parameter of download function) is called and temporary file is deleted.
But in my case of a multi-pages application, on_action function is not properly called since it leads here https://github.com/Avaiga/taipy/blob/develop/taipy/gui/gui.py#1630 ( _warn(f"on_action(): '{action}' is not a valid function.") )

Expected Behavior

In any cases of application (espacially in multi-pages application with each page in separate module),
the on_action parameter of download function must allow to delete properly the temporary file required for dynamic file_download functionnalilty.

Additional Context

Acceptance Criteria

• A unit test reproducing the bug is added.
• Any new code is covered by a unit tested.
• Check code coverage is at least 90%.
• The bug reporter validated the fix.
• Related issue(s) in taipy-doc are created for documentation and Release Notes are updated.

Code of Conduct

• I have checked the existing issues.
• I am willing to work on this issue (optional)

[AlexandreSajus]

Thanks for the bug report. Could you please provide a piece of code that reproduces your issue so we can take a look?