remove opentelemetry for cpu build

Author: heyselbi

requirements/common.txt

@@ -43,7 +43,3 @@ watchfiles # required for http server to monitor the updates of TLS files
 python-json-logger # Used by logging as per examples/other/logging_configuration.md
 scipy # Required for phi-4-multimodal-instruct
 ninja # Required for xgrammar, rocm, tpu, xpu
-opentelemetry-sdk>=1.26.0 # vllm.tracing
-opentelemetry-api>=1.26.0 # vllm.tracing
-opentelemetry-exporter-otlp>=1.26.0 # vllm.tracing
-opentelemetry-semantic-conventions-ai>=0.4.1 # vllm.tracing