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
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