Rollup merge of #91697 - dtolnay:lossyfromstr, r=Mark-Simulacrum

Delete Utf8Lossy::from_str

This whole type is marked as being for str internals only, but this constructor is never used by str internals. If you had a &str already and wanted to lossy display it or iterate its lossy utf8 chunks, you would simply not use Utf8Lossy because the whole &str is known to be one contiguous valid utf8 chunk.

If code really does need to obtain a value of type &Utf8Lossy somewhere, and has only a &str, `Utf8Lossy::from_bytes(s.as_bytes())` remains available. As currently implemented, there is no performance penalty relative to `from_str` i.e. the Utf8Lossy does not "remember" that it was constructed using `from_str` to bypass later utf8 decoding.

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