Remove unnecessary iterator in Language.pipe (#5101)
Remove unnecessary iterator in Language.pipe (#5101)

Remove iterator over `raw_texts` with `iterator.tee()` in
`Language.pipe` that is never consumed and consumes memory
unnecessarily.
spacy-io/spaCy,explosion/spaCy,explosion/spaCy,explosion/spaCy,spacy-io/spaCy,spacy-io/spaCy,honnibal/spaCy,honnibal/spaCy,explosion/spaCy,explosion/spaCy,honnibal/spaCy,explosion/spaCy,spacy-io/spaCy,spacy-io/spaCy,spacy-io/spaCy,honnibal/spaCy