[Bug] Dev container doesn't install all package needed for development at local

[KentHsu]

Expected Behavior

When developing python-dsk with dev container, all packages should be installed after container starts running and developers can develop and test in container at local easily.

Actual Behavior

Only part of the tests show up and lots of ModuleNotFoundError in the error logs.

Steps to Reproduce the Problem

Run python-sdk in VSCode with dev container. Check VSCode testing tab and error logs.

Release Note

RELEASE NOTE: FIX .devcontainer.json configuration