Add reload_open_files() to script editor

[nikitalita]

Supersedes #83267

This adds reload_open_files() to the script editor.

Pursuant to @kitbdev 's feedback:

This can cause unsaved changes to be lost without confirmation.
It would be better to expose _test_script_times_on_disk (and maybe _update_modified_scripts_for_external_editor which is usually called after it?, effectively _on_find_in_files_modified_files) if needed.

I have implemented reload_open_files() to call _test_script_times_on_disk() and _update_modified_scripts_for_external_editor(). This will reload all the scripts if there are no unsaved scripts; if there are, the user will be prompted to save them first.

• bugsquad edit Closes Expose ScriptEditor.reload_scripts() godot-proposals#8111

[kitbdev]

Looks good, makes sense to expose this.

[Repiteo]

Needs squash

[Repiteo]

Thanks!

(PR is merged, GitHub is being slow to update)