Fix TraceLens Docker images to install runtime dependencies

[haofrank]

Summary

• Replace pip install --no-deps /tmp/TraceLens in inference Docker build workflows
• Install TraceLens with runtime dependencies such as orjson and matplotlib
• Add build-time validation for core TraceLens inference imports and CLI commands

Details

The vLLM and SGLang inference Docker workflow scripts previously installed TraceLens with --no-deps, which allowed images to contain TraceLens entry points while missing required runtime dependencies.

This could make TraceLens post-processing fail later with errors such as:

ModuleNotFoundError: No module named 'orjson'

Updated scripts:

• examples/custom_workflows/inference_analysis/build_docker_vllm.sh
• examples/custom_workflows/inference_analysis/build_docker_sglang.sh

Both now install TraceLens with dependencies:
pip install --upgrade /tmp/TraceLens