.NET: Prevent generating mono glue in project folder

[akien-mga]

• Fixes Godot crashes when generating mono glue if PWD is godot project #83128.
• Supersedes Fix crash when generating mono glue #83129.

$ cd ~/some/project
$ /Godot/godot/bin/godot.linuxbsd.editor.dev.x86_64.mono --generate-mono-glue .
ERROR: --generate-mono-glue: Cannot generate Mono glue while running a game project. Change current directory or enable --editor.
   at: handle_cmdline_args (modules/mono/editor/bindings_generator.cpp:4977)
$ /Godot/godot/bin/godot.linuxbsd.editor.dev.x86_64.mono --generate-mono-glue . -e
// works

[AThousandShips]

Makes me wonder if we should add complementary cases, either a is_editor_or_project_manager_hint or a is_game/running_hint or something like it, though I'm not sure how often this particular check is used, or the complement

[akien-mga]

This is something I'd like to refactor one day, main.cpp and the whole logic to infer what mode to run based on context is very hacky.

We should change it so there's a lot more intent on what to run (can still be implicit for the user but the code flow needs to be explicit), and then we can store which run mode we're using in an enum instead of these custom bools.

[AThousandShips]

Makes sense to me, haven't tried but the logic is valid

[raulsntos]

Works as expected, thanks!