Allow parsers to declare uses remote, and remote ocr_mode (#13634)

* uses_remote_service + allow_remote to allow opt-in / out of remote OCR

* Add to parser dev docs

* remote_ocr_mode config setting

* Checks for remote_ocr_mode and fix import

* Update config.component.spec.ts

* More tests for remote_ocr_mode

* Docs for remote_ocr_mode

* Ok, wire up the remote_ocr_mode with allow_remote for consumer

* Update consumer.py

* Format remote OCR mode check tests

* Use get_choice_from_env

src/documents/tests/test_api_app_config.py

@@ -75,6 +75,7 @@ class TestApiAppConfig(DirectoriesMixin, APITestCase):
                 "remote_ocr_engine": None,
                 "remote_ocr_api_key": None,
                 "remote_ocr_endpoint": None,
+                "remote_ocr_mode": None,
                 "ai_enabled": False,
                 "llm_embedding_backend": None,
                 "llm_embedding_model": None,