Update 'qmk generate-api' to only publish pure DD keymaps (#24782)

lib/python/qmk/cli/generate/api.py

@@ -131,6 +131,11 @@ def generate_api(cli):
             if keymap_rel is None:
                 cli.log.debug('Skipping keymap %s (not in qmk_firmware)', keymap)
                 continue
+
+            if (keymap_rel / 'keymap.c').exists():
+                cli.log.debug('Skipping keymap %s (not pure dd keymap)', keymap)
+                continue
+
             kb_json['keymaps'][keymap.name] = {
                 # TODO: deprecate 'url' as consumer needs to know its potentially hjson
                 'url': f'https://raw.githubusercontent.com/qmk/qmk_firmware/master/{keymap_rel}/keymap.json',