Python plugin with core24 and gnome extension broken

[sergiusens]

Bug Description

Migration of the core22 plugin logic to core24 is broken.

This might as well be a gnome content snap problem, as such the test cannot be enabled

To Reproduce

Pack the proposed snapcraft.yaml with the sources at https://github.com/canonical/snapcraft/tree/main/tests/spread/plugins/craft-parts/build-and-run-hello/python-hello/src

Environment

spread 24.04

snapcraft.yaml

name: python-hello
version: "1.0"
summary: simple python application
description: build a python application using core22
base: core24
confinement: strict

apps:
  python-hello:
    command: bin/hello
    extensions: [gnome]

parts:
  hello:
    plugin: python
    source: src

Relevant log output

# python-hello
Python path configuration:
  PYTHONHOME = (not set)
  PYTHONPATH = '/snap/python-hello/x1/gnome-platform/usr/lib/python3/dist-packages'
  program name = 'python3'
  isolated = 0
  environment = 1
  user site = 1
  safe_path = 0
  import site = 1
  is in build tree = 0
  stdlib dir = '/snap/gnome-46-2404-sdk/current/usr/lib/python3.12'
  sys._base_executable = '/usr/bin/python3.12'
  sys.base_prefix = '/snap/gnome-46-2404-sdk/current/usr'
  sys.base_exec_prefix = '/snap/gnome-46-2404-sdk/current/usr'
  sys.platlibdir = 'lib'
  sys.executable = '/snap/python-hello/x1/bin/python3'
  sys.prefix = '/snap/gnome-46-2404-sdk/current/usr'
  sys.exec_prefix = '/snap/gnome-46-2404-sdk/current/usr'
  sys.path = [
    '/snap/python-hello/x1/gnome-platform/usr/lib/python3/dist-packages',
    '/snap/gnome-46-2404-sdk/current/usr/lib/python312.zip',
    '/snap/gnome-46-2404-sdk/current/usr/lib/python3.12',
    '/snap/gnome-46-2404-sdk/current/usr/lib/python3.12/lib-dynload',
  ]
Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
ModuleNotFoundError: No module named 'encodings'

Current thread 0x00007dc98b0a6740 (most recent call first):
  <no Python frame>

Additional context

No response