Remove `sourced_pipelines` association for Bridge jobs
What does this MR do and why?
In #218393 (closed) we discussed the need to have a job trigger only 1 downstream pipeline. A previous MR !103980 (merged) was reverted as we found that removing the has_many :sourced_pipelines
relationship from Build
jobs caused a regression. So in this MR, we remove the relationship for only Bridge
jobs. And we are putting it behind a feature flag.
MR acceptance checklist
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Related to #218393 (closed)
Edited by Leaminn Ma