opentelemetry-propagator-ot-trace not released as a part of the release process

[marcinzaremba]

Describe your environment
N/A

Steps to reproduce

1. Go to https://pypi.org/project/opentelemetry-propagator-ot-trace/
2. Observe "not found" screen.

What is the expected behavior?
opentelemetry-propagator-ot-trace package should be released with the release process and present in PyPI.

What is the actual behavior?
opentelemetry-propagator-ot-trace is not present in PyPI.

Additional context
It seems that with the addition of opentelemetry-propagator-ot-trace package a new top category/folder was introduced into the codebase, but the build script was not updated accordingly: https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/scripts/build.sh#L19