Rollup merge of #83421 - faern:add-into-err, r=joshtriplett
Add Result::into_err where the Ok variant is the never type Equivalent of #66045 but for the inverse situation where `T: Into<!>` rather than `E: Into<!>`. I'm using the same feature gate name. I can't see why one of these methods would be OK to stabilize but not the other. Tracking issue: #61695
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