Ensure we generate predictive pipeline if we run any predictive

What does this MR do and why?

Ensure we generate predictive pipeline if we run any predictive pipelines

This fixes the following case:

• Changes in both db-patterns and core-backend-patterns before approval

Before this fix, we wanted to run db-predictive but we didn't run regular predictive, which caused it to not generate the pipeline the db-predictive needed.

This was reported at #453973 (comment 1884507794)

How to validate

This was tested at !151377 (closed) where we can see the pipeline: https://gitlab.com/gitlab-org/gitlab/-/pipelines/1271999444

• Run regular rspec because it changes core-backend-patterns which we made it run regular rspec instead of predictive even before approval
• Run predictive single-db rspec because it also added migrations which touch db-patterns

Related to #453973 (closed)