backport: Revert addition of into_ascii_* methods
#32467
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The addition of these methods in rust-lang#31335 required adding impls of the trait for the `String` and `Vec<T>` types. This unfortunately caused a regression (rust-lang#32074) in type inference for using these methods which the libs team has decided to not push forward with. These methods were stabilized in rust-lang#32020 which was intended to get backported to beta, but the backport hasn't happened just yet. This commit reverts both the addition and stabilization of these methods. One proposed method of handling this, in rust-lang#32076, was to move the methods to an extra trait to avoid conflicts with type inference. After some discussion, however, the libs team concluded that we probably want to reevaluate what we're doing here, so discussion will continue on the tracking issue, rust-lang#27809. Conflicts: src/libstd/ascii.rs
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This is a backport of #32314