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## Summary
It turns out that _some_ identifiers can contain newlines --
specifically, dot-delimited import identifiers, like:
```python
import foo\
.bar
```
At present, we print all identifiers verbatim, which causes us to retain
the `\` in the formatted output. This also leads to violating some debug
assertions (see the linked issue, though that's a symptom of this
formatting failure).
This PR adds detection for import identifiers that contain newlines, and
formats them via `text` (slow) rather than `source_code_slice` (fast) in
those cases.
Closes https://github.com/astral-sh/ruff/issues/7734.
## Test Plan
`cargo test`
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| .. | ||
| comments | ||
| expression | ||
| module | ||
| other | ||
| pattern | ||
| snapshots | ||
| statement | ||
| type_param | ||
| builders.rs | ||
| cli.rs | ||
| context.rs | ||
| generated.rs | ||
| lib.rs | ||
| main.rs | ||
| options.rs | ||
| prelude.rs | ||
| verbatim.rs | ||