Update issue_mr_flow agent tracking to consumer SA
The following discussion from !212776 should be addressed: - [ ] @fdegier started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/212776#note_2932849003): (+3 comments) > Currently this is the account we're using, but soon this will change to a SA per namespace per flow. > > I'm fine with merging as-is but would you be able to think of a way to incorporate the actual SA? I think we could have a check if the `current_user` has composite identity enabled, if it does, the current user should already be the SA otherwise we take `current_user.human_user`.
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