GB writes files atomically and in the end it boils down to allocating bytes
and writing them all at once.
Now this capability lives in the `fs` module.
If for whichever reason the parsing of parts of the vbranch.toml file
fails, this would be a permanent error until the file is fixed or removed.
Now it's also displayed along with the error to make clearing the file
more convenient.
This is done one-time (for now) using a nightly feature of cargo-fmt
as defined in `rustfmt-nightly.toml.`
It's planned to make this the default so imports will always be sorted.
For now it can be run manually with:
cargo +nightly fmt -- --config-path rustfmt-nightly.toml
or
pnpm rustfmtTBD
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