Build integration-test gem and update README

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Proposal

The purpose of this issue is to add a job to the integration-test project to automatically build and publish a Rubygem, and improve the image integration test README to explain how to use it.

Proposal

1. Update the pipeline of the integration-test project to build a Rubygem, and to push it to the Package Registry of the project.

2. Update (or add) a Gemfile for each of the dependency scanning analyzer projects:

   • gemnasium
   • [-] gemnasium-maven
   • [-] gemnasium-python

   To do the following:

   • Add the Package Registry of integration-test as a gem source.
   • Declare gitlab-secure-integration_test as a test dependency.

3. Update the docs

   • Move the Image integration tests section from the gemnasium README to the integration-test README and update the Running image integration tests using ruby sub-section so it references the changes made in steps 1. and 2. above.
   • Replace the Image integration tests section of the gemnasium-maven README with a link to the corresponding section in the image-integration project README
   • Add a link in the gemnasium-python README to also point to the section in the image-integration project README that explains how to use the image integration tests

/cc @NicoleSchwartz @gonzoyumo @fcatteau