chore: remove atlantis configuraiton [ENG-6124] (#21)

[ENG-6124](https://stacklet.atlassian.net/browse/ENG-6124)

### what

remove atlantis configuration

### why

it's no longer used

### testing

n/a

### docs

n/a


[ENG-6124]:
https://stacklet.atlassian.net/browse/ENG-6124?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: albertodonato