Move jest predictive as-if-foss from jobs to pipelines

What does this MR do and why?

Move jest predictive as-if-foss from jobs to pipelines

This means we run jest predictive in the as-if-foss pipeline

All the dependent jobs for jest predictive as-if-foss can be removed because none of them are needed anymore and all of them would run in the as-if-foss pipeline in order to run jest predictive over there.

Code reduction: 6 file +7 −77

How to set up and validate locally

This is tested at !154276 (closed) where it's using pipeline:run-as-if-foss to enable the FOSS pipeline, and the FOSS pipeline do run jest predictive which should be the equivalent of jest predictive as-if-foss.

The as-if-foss pipeline can be found at https://gitlab.com/gitlab-org/gitlab-foss/-/pipelines/1307183858

Part of gitlab-org/quality/engineering-productivity/team#463 (closed)