Auto merge of #95960 - jhpratt:remove-rustc_deprecated, r=compiler-errors

Remove `#[rustc_deprecated]`

This removes `#[rustc_deprecated]` and introduces diagnostics to help users to the right direction (that being `#[deprecated]`). All uses of `#[rustc_deprecated]` have been converted. CI is expected to fail initially; this requires #95958, which includes converting `stdarch`.

I plan on following up in a short while (maybe a bootstrap cycle?) removing the diagnostics, as they're only intended to be short-term.

diff --cc compiler/rustc_feature/src/builtin_attrs.rs
Simple merge

diff --cc compiler/rustc_lint_defs/src/builtin.rs
Simple merge

diff --cc compiler/rustc_middle/src/middle/stability.rs
Simple merge

diff --cc library/alloc/src/slice.rs
Simple merge

diff --cc library/core/src/fmt/mod.rs
Simple merge

diff --cc library/core/src/hash/sip.rs
Simple merge

diff --cc library/core/src/intrinsics.rs
Simple merge

diff --cc library/core/src/macros/mod.rs
Simple merge

diff --cc library/core/src/num/f32.rs
Simple merge

diff --cc library/core/src/num/f64.rs
Simple merge

diff --cc library/core/src/num/int_macros.rs
Simple merge

diff --cc library/core/src/num/uint_macros.rs
Simple merge

diff --cc library/core/src/sync/atomic.rs
Simple merge

diff --cc library/std/src/env.rs
Simple merge

diff --cc library/std/src/error.rs
Simple merge

diff --cc library/std/src/fs.rs
Simple merge

diff --cc library/std/src/os/linux/fs.rs
Simple merge

diff --cc library/std/src/os/unix/process.rs
Simple merge

diff --cc library/std/src/thread/mod.rs
Simple merge

diff --cc src/librustdoc/html/render/mod.rs
Simple merge