unshelve: mark unshelve interactive as experimental
This is a follow-up patch to rHG5162753c4c14.
We have the logic for interactive unshelve under `_rebaserestorecommit()`.
So, we might get conflicts even if there are conflicting changes other than
selected changes by the user. We should mark unshelve `--interactive` as
`EXPERIMENTAL` until we solve this issue.
Differential Revision: https://phab.mercurial-scm.org/D6653
#require docutils gettext
$ $TESTDIR/check-gendoc da
checking for parse errors