Revert changes from main commits that were merged into blender-v4.1-release

The last good commit was f57e4c5b98.

After this one more fix was committed, this one is preserved as well:
67bd678887.

doc/python_api/examples/bpy.utils.register_cli_command.1.py

@@ -1,73 +0,0 @@
-"""
-**Using Python Argument Parsing**
-
-This example shows how the Python ``argparse`` module can be used with a custom command.
-
-Using ``argparse`` is generally recommended as it has many useful utilities and
-generates a ``--help`` message for your command.
-"""
-
-import os
-import sys
-
-import bpy
-
-
-def argparse_create():
-    import argparse
-
-    parser = argparse.ArgumentParser(
-        prog=os.path.basename(sys.argv[0]) + " --command keyconfig_export",
-        description="Write key-configuration to a file.",
-    )
-
-    parser.add_argument(
-        "-o", "--output",
-        dest="output",
-        metavar='OUTPUT',
-        type=str,
-        help="The path to write the keymap to.",
-        required=True,
-    )
-
-    parser.add_argument(
-        "-a", "--all",
-        dest="all",
-        action="store_true",
-        help="Write all key-maps (not only customized key-maps).",
-        required=False,
-    )
-
-    return parser
-
-
-def keyconfig_export(argv):
-    parser = argparse_create()
-    args = parser.parse_args(argv)
-
-    # Ensure the key configuration is loaded in background mode.
-    bpy.utils.keyconfig_init()
-
-    bpy.ops.preferences.keyconfig_export(
-        filepath=args.output,
-        all=args.all,
-    )
-
-    return 0
-
-
-cli_commands = []
-
-
-def register():
-    cli_commands.append(bpy.utils.register_cli_command("keyconfig_export", keyconfig_export))
-
-
-def unregister():
-    for cmd in cli_commands:
-        bpy.utils.unregister_cli_command(cmd)
-    cli_commands.clear()
-
-
-if __name__ == "__main__":
-    register()

doc/python_api/examples/bpy.utils.register_cli_command.py

@@ -1,42 +0,0 @@
-"""
-**Custom Commands**
-
-Registering commands makes it possible to conveniently expose command line
-functionality via commands passed to (``-c`` / ``--command``).
-"""
-
-import sys
-import os
-
-
-def sysinfo_command(argv):
-    import tempfile
-    import sys_info
-
-    if argv and argv[0] == "--help":
-        print("Print system information & exit!")
-        return 0
-
-    with tempfile.TemporaryDirectory() as tempdir:
-        filepath = os.path.join(tempdir, "system_info.txt")
-        sys_info.write_sysinfo(filepath)
-        with open(filepath, "r", encoding="utf-8") as fh:
-            sys.stdout.write(fh.read())
-    return 0
-
-
-cli_commands = []
-
-
-def register():
-    cli_commands.append(bpy.utils.register_cli_command("sysinfo", sysinfo_command))
-
-
-def unregister():
-    for cmd in cli_commands:
-        bpy.utils.unregister_cli_command(cmd)
-    cli_commands.clear()
-
-
-if __name__ == "__main__":
-    register()