rust-dirstatemap: temporarily use `from_v1_data` in `addfile`
We are about to change the `__init__` for `DirstateItem`. To make the
transition easier, we move existing caller to `DirstateItem.from_v1_data`.
The Rust dirstate map will need an overall once the durst settle anyway.
Differential Revision: https://phab.mercurial-scm.org/D11319
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