Build details showing triggering user incorrectly as current_user

Summary

Viewing a build in Pipelines > Builds > Build shows current_user as the user that started the build, even when that is not the case. For example, a build is triggered as part of a pipeline by user A, however when user B view the build as part of the pipeline, it shows that they (user B) started the build. Viewing the associated pipeline then shows the correct user A

Steps to reproduce

1. user A commits a change to a branch, triggering a pipeline with build
2. user B views the build

Expected behavior

Build page will show the user that started the build (user A)

Actual behavior

Build shows current_user as the user that started the build, when viewing the build.

Relevant logs and/or screenshots

Build https://dev.gitlab.org/gitlab/omnibus-gitlab/builds/258194

Pipeline https://dev.gitlab.org/gitlab/omnibus-gitlab/pipelines/26308

Output of checks

Seen on dev.gitlab.com

Suspected cause

• https://gitlab.com/gitlab-org/gitlab-ce/commit/78874519db2ca2f18a2fbca5fe070292e521d0c1
• https://gitlab.com/gitlab-org/gitlab-ce/commit/061bb6eb6ed0ca6be3c571b3fcfd14a6f9729205