refactor(model): move api-based embeddings/reranking calls out of model server (onyx-dot-app#5216)

* move api-based embeddings/reranking calls to api server out of model server, added/modified unit tests

* ran pre-commit

* fix mypy errors

* mypy and precommit

* move utils to right place and add requirements

* precommit check

* removed extra constants, changed error msg

* Update backend/onyx/utils/search_nlp_models_utils.py

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

* greptile

* addressed comments

* added code enforcement to throw error

---------

Co-authored-by: Jessica Singh <jessicasingh@Mac.attlocal.net>
Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

Author: 3 people

backend/model_server/constants.py

@@ -1,34 +1,5 @@
-from shared_configs.enums import EmbeddingProvider
-from shared_configs.enums import EmbedTextType
-
-
 MODEL_WARM_UP_STRING = "hi " * 512
 INFORMATION_CONTENT_MODEL_WARM_UP_STRING = "hi " * 16
-DEFAULT_OPENAI_MODEL = "text-embedding-3-small"
-DEFAULT_COHERE_MODEL = "embed-english-light-v3.0"
-DEFAULT_VOYAGE_MODEL = "voyage-large-2-instruct"
-DEFAULT_VERTEX_MODEL = "text-embedding-005"
-
-
-class EmbeddingModelTextType:
-    PROVIDER_TEXT_TYPE_MAP = {
-        EmbeddingProvider.COHERE: {
-            EmbedTextType.QUERY: "search_query",
-            EmbedTextType.PASSAGE: "search_document",
-        },
-        EmbeddingProvider.VOYAGE: {
-            EmbedTextType.QUERY: "query",
-            EmbedTextType.PASSAGE: "document",
-        },
-        EmbeddingProvider.GOOGLE: {
-            EmbedTextType.QUERY: "RETRIEVAL_QUERY",
-            EmbedTextType.PASSAGE: "RETRIEVAL_DOCUMENT",
-        },
-    }
-
-    @staticmethod
-    def get_type(provider: EmbeddingProvider, text_type: EmbedTextType) -> str:
-        return EmbeddingModelTextType.PROVIDER_TEXT_TYPE_MAP[provider][text_type]
 
 
 class GPUStatus: