Auto merge of #12091 - samueltardieu:issue-12068, r=Alexendoo

Add .as_ref() to suggestion to remove .to_string()

The case of `.to_owned().split(…)` is treated specially in the `unnecessary_to_owned` lint. Test cases check that it works both for slices and for strings, but they missed a corner case: `x.to_string().split(…)` when `x` implements `AsRef<str>` but not `Deref<Target = str>`. In this case, it is wrong to suggest to remove `.to_string()` without adding `.as_ref()` instead.

Fix #12068

changelog: [`unnecessary_to_owned`]: suggest replacing `.to_string()` by `.as_ref()`

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