os: new test TestOpenFileCreateExclDanglingSymlink fails on Plan 9 [1.24 backport] #75359
Description
@millerresearch requested issue #73729 to be considered for backport to the next 1.24 minor release.
@gopherbot please consider this for backport to 1.24
CL 672396, which caused this issue by breaking the plan9 gotip builders, has been backported to 1.23 and 1.24. So the plan9 builders for those branches are now broken too. It would be helpful to undo the damage at least to the 1.24 branch by backporting the correction.