The content of this directory is meant to be used by Parity's private CI/CD infrastructure with private tools. At the moment those tools are still early stage of development and we don't know if / when they will available for public use.
parachains
At the moment this directory only have one test related to parachains: /parachains-smoke-test, that check the parachain registration and the block height.
Ping in element Javier to ask questions or grant permission to run the test from your local setup.