Don't display the collapsed file global warning when the MR only has one file
Context
When rendering a MR with only one file and the setting "Show whitespace changes" disabled, it's common to display that single file collapsed if it's larger than the limits.
We are pursuing a fix to the underlying problem, but in the mean time... we're display two large warnings side by side.
Proposal
If MR only has one file, don't render the global warning. If the file happens to be collapsed (as in the scenario described above), one warning is enough.