Revert "Use ingestion pipeline in Python code (#61)"

.changeset/short-ducks-drum.md

templates/components/loaders/python/file.py

templates/components/vectordbs/python/astra/__init__.py

templates/components/vectordbs/python/astra/generate.py

templates/components/vectordbs/python/astra/index.py

templates/components/vectordbs/python/milvus/__init__.py

templates/components/vectordbs/python/milvus/generate.py

templates/components/vectordbs/python/milvus/index.py

templates/components/vectordbs/python/mongo/__init__.py

templates/components/vectordbs/python/mongo/generate.py

templates/components/vectordbs/python/mongo/index.py

templates/components/vectordbs/python/none/__init__.py

templates/components/vectordbs/python/none/constants.py

templates/components/vectordbs/python/none/generate.py

templates/components/vectordbs/python/none/index.py

templates/components/vectordbs/python/none/vectordb.py

templates/components/vectordbs/python/pg/__init__.py

templates/components/vectordbs/python/pg/constants.py

templates/components/vectordbs/python/pg/generate.py

templates/components/vectordbs/python/pg/index.py