API security tests

**Description**

Before releasing Airflow 2.0, we should review the code and consider whether it is safe.

More information about REST API:
https://github.com/apache/airflow/issues/8107

**Use case / motivation**

I want to make the internet a safer and better place in the digital world.

**Related Issues**

N/A