Disable editing for inherited iterations
When viewing an inherited iteration, the user can click to show the edit form. This should not happen as users should only be able to edit iterations at the source to avoid confusion.
... Currently you can get to the edit form but not submit it.
We should probably disable editing for subgroups as well, since those you can edit but probably don't want to (as it will unwittingly affect the parent iteration)
Project iterations are behind the feature flag project_iterations
Edited by Coung Ngo