Do not add "detached" label for fast-forward merge request pipelines.
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Problem to solve
The detached label is unneeded and can be confusing in fast-forward scenarios.
Intended users
Further details
The detached label in merge request pipelines is a sort of warning sign.
When fast-forward merges are enabled, and the MR is fast-forwardable, the "detached" pipeline is actually an accurate representation of what the merge result will be, and so the the detached label could be omitted.
This may be unnecessary if merge result pipelines are implemented for fast-forward merge (see #26996 (closed) #35628 (closed)), but it would still be useful if pipelines for merge results are disabled or unavailable.
Proposal
If a project uses fast-forward merges (or semi-linear?), and a MR is fast-forwardable, do not add detached to the MR pipeline.