Explore adding Release Web endpoint to the GPT

Explore how can we prepare test data for this endpoint and add it to the GPT.

• GET project/-/releases - Releases web page

• Create a bug if the endpoint response time is above the main target(500 ms)

Update from 2021-01-20: The problem with the web test is that when requesting https://gitlab.com/gitlab-org/gitlab/-/releases through the web - it just responses with html code and there is some script that fetches the data. The script is not being triggered outside of the browser. Dynamic web elements is a tricky area, we will need to discuss this problem with Frontend team - maybe there is a workaround. (see comment below #230 (comment 489798510))