Add an option to disable Python at startup

[lbartoletti]

Description

This PR introduces a new command-line option --nopython to disable Python support at QGIS startup.

While QGIS must be built with WITH_BINDINGS (default to true) to include Python support, this option provides a way to disable it at runtime without requiring a rebuild. This can be useful in scenarios where QGIS is installed with Python enabled, but the user wants to start it without Python for performance reasons or to avoid potential issues related to Python dependencies.

Of course, if the goal is to completely disable Python in QGIS, a more robust approach (such as compiling without WITH_BINDINGS) is necessary. This change is a first step to allow users more flexibility when managing Python usage in their QGIS environments.

cc @Djedouas @florentfgrs @troopa81

[github-actions]

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[github-actions]

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