Respect "compress_binary_resources" editor setting on scene import

[gelvinp]

ResourceImporterScene::import() did not check the filesystem/on_save/compress_binary_resources editor setting to set FLAG_COMPRESS when saving after import, while EditorNode::save_resource_in_path() did, causing imported scenes (e.g. from gLTF files) to be larger than scenes created by manually saving in the editor.

Closes #71538

[Calinou]

Note for users and testers: you must remove the .godot/ folder in the project while the editor is closed for changes from this PR to be effective. Godot will not automatically reimport resources when you toggle the Compress Binary Resources editor setting.

[Calinou]

Tested locally (rebased against master a83eb16), it works. The imported SCN file from the MRP now weighs 1.8 KB instead of 4.8 KB.

[akien-mga]

Thanks!