Introduce `Job` model and re-structure test hierarchy

[JenySadadia]

• Introduce Job model for job/test suite nodes
• Introduce setup test suite for pre-check runs for tast test
• Tweaked LAVA callback data parsing to re-structure test hierarchy
• Calculate job node results based on child test nodes

[JenySadadia]

tast test hierarchy with setup test suite: https://staging.kernelci.org:9000/viewer?node_id=6661733f451ad0645154c1c2

[nuclearcat]

Let's check for today, and if all ok, i merge at evening