GH-35635: [C++][CI] Preserve root when ignoring host on PathFromUriHelper to fix HDFS tests #36063
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Rationale for this change
As discussed on the issue the HDFS filesystem should be returning
/
if the entire path is/
What changes are included in this PR?
Change behavior of helper
PathFromUriHelper
when ignoring host to preserve/
Are these changes tested?
On CI and archery.
Are there any user-facing changes?
No