Before we publish a pkg to PyPi, install release candidate package with pip to verify it #622
Description
As a follow up to #598 , we identified an action item to update the build_a_package.sh script to install the built Python package before we publish it to PyPi just to be sure that everything is working correctly.
Specifically, we want to add a step to download the package before we publish it to PyPi here:
opentelemetry-python-contrib/.github/workflows/publish-a-package.yml
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