deps(conda): use transformers-env with vllm,exllama(2) (#1554)

* deps(conda): use transformers with vllm

* join vllm, exllama, exllama2, split petals

backend/python/vllm/Makefile

@@ -1,8 +1,6 @@
 .PHONY: vllm
 vllm:
-	@echo "Creating virtual environment..."
-	@conda env create --name vllm --file vllm.yml
-	@echo "Virtual environment created."
+	$(MAKE) -C ../common-env/transformers
 
 .PHONY: run
 run: