Auto merge of #124097 - compiler-errors:box-into-iter, r=WaffleLapkin

Add `IntoIterator` for `Box<[T]>` + edition 2024-specific lints

* Adds a similar method probe opt-out mechanism to the `[T;N]: IntoIterator` implementation for edition 2021.
* Adjusts the relevant lints (shadowed `.into_iter()` calls, new source of method ambiguity).
* Adds some tests.
* Took the liberty to rework the logic in the `ARRAY_INTO_ITER` lint, since it was kind of confusing.

Based mostly off of #116607.

ACP: rust-lang/libs-team#263
References #59878
Tracking for Rust 2024: rust-lang/rust#123759

Crater run was done here: rust-lang/rust#116607 (comment)
Consensus afaict was that there is too much breakage, so let's do this in an edition-dependent way much like `[T; N]: IntoIterator`.

Author: bors

tests/fail/shims/backtrace/bad-backtrace-decl.rs

@@ -5,7 +5,7 @@ extern "Rust" {
 
 fn main() {
     let frames = unsafe { miri_get_backtrace(0) };
-    for frame in frames.into_iter() {
+    for frame in frames.iter() {
         unsafe {
             miri_resolve_frame(*frame, 0); //~ ERROR: Undefined Behavior: bad declaration of miri_resolve_frame - should return a struct with 5 fields
         }

tests/pass/backtrace/backtrace-api-v0.rs

@@ -27,7 +27,7 @@ fn func_d() -> Box<[*mut ()]> {
 fn main() {
     let mut seen_main = false;
     let frames = func_a();
-    for frame in frames.into_iter() {
+    for frame in frames.iter() {
         let miri_frame = unsafe { miri_resolve_frame(*frame, 0) };
         let name = String::from_utf8(miri_frame.name.into()).unwrap();
         let filename = String::from_utf8(miri_frame.filename.into()).unwrap();

tests/pass/backtrace/backtrace-api-v1.rs

@@ -32,7 +32,7 @@ fn func_d() -> Box<[*mut ()]> {
 fn main() {
     let mut seen_main = false;
     let frames = func_a();
-    for frame in frames.into_iter() {
+    for frame in frames.iter() {
         let miri_frame = unsafe { miri_resolve_frame(*frame, 1) };
 
         let mut name = vec![0; miri_frame.name_len];