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Auto merge of #140732 - onur-ozkan:use-in-tree-rustfmt, r=Kobzol
make it possible to run in-tree rustfmt with `x run rustfmt`
Currently, there is no way to run in-tree `rustfmt` using `x fmt` or `x test tidy` commands. This PR implements `rustfmt` on `x run`, which allows bootstrap to run the in-tree `rustfmt`.
Fixes #140723
