Create python-setuptools test project

Problem to solve

As discussed here, we don't currently have a secure test project for the python-setuptools package manager. The purpose of this issue is to create one.

Implementation plan

1. Create a new test project named python-setuptools.
2. Create a dependency file in this new test project for the version of setuptools pre-installed in gemnasium, which is currently 50.3.2.
3. Add a new python-setuptools directory to gemnasium-python/qa/expect
4. Create a gl-dependency-scanning-report.json expected dependency file in the gemnasium-python/qa/expect/python-setuptools directory created in step 3.
5. Add a new downstream QA test in gemnasium-python to analyze the new python-setuptools test project created in step 1. and compare the results to the expected dependency report added in step 4.
6. Update the Tested Versions entry for Setuptools in the Obtaining dependendency information by parsing lockfiles table in the Dependency Scanning documentation to show that 50.x of setuptools is supported.

User experience goal

Improved testing for python dependency scanning

Documentation

Dependency Scanning documentation will be updated as part of this issue.

Availability & Testing

A new test project will be added as part of this issue

What does success look like, and how can we measure that?

A new test project is added to confirm that setuptools >= 50.x is supported

What is the type of buyer?

Enterprise Edition GitLab Ultimate

Is this a cross-stage feature?

No, this only affects ~"Category:Dependency Scanning"

/cc @NicoleSchwartz @gonzoyumo @fcatteau

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