MR widgets do not show when reports are generated only in downstream pipelines
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### Summary
When a pipeline triggers downstream pipelines, the security MR Widget does not show if the security scanners do not run in the main pipeline but **only** in the child pipelines.
### Steps to reproduce
Create a pipeline that does nothing else than trigger a child pipeline.
In this child pipeline, run the SAST template.
### Example Project
https://gitlab.com/gl-demo-ultimate-odupre/public/iac-terraform-multi-environments/-/merge_requests/3
### What is the current *bug* behavior?
The MR widgets do not show.
### What is the expected *correct* behavior?
The MR widgets should show no matter where the security (or performance, or quality) reports are produced.
### Output of checks
<!-- If you are reporting a bug on GitLab.com, uncomment below -->
This bug happens on GitLab.com
cc @minac
FYI: https://gitlab.slack.com/archives/C8S0HHM44/p1706540311487409?thread_ts=1704295381.953209&cid=C8S0HHM44
issue