Auto merge of #106458 - albertlarsan68:move-tests, r=jyn514

Move src/test to the root

See MCP at rust-lang/compiler-team#573

There may be more changes needed.

The first commit is just the move of the files:
You can check that the first commit did not do anything else than renames by running
```
git diff --diff-filter=r -M100% <rust-lang remote>/master <first commit hash>
```
The output should be empty, because the filter excludes renames, and the match threshold for qualifying a rename is 100%.

The second one is mostly a "find and replace" of `src/test` to `tests` and whatever is needed to make CI pass.

What is left to do:
---

- [x] Move directory
- [ ] Change references to `src/test`
    - [x] Change references in-tree
    - [ ] Change references in submodules / out-of-tree docs
- [x] Make CI pass:
    - [x] Fix tidy
    - [x] Fix tests
    - [x] Bless tests if needed (shouldn't normally)
- [ ] Merge it !

1 files changed, 0 insertions, 32 deletions

diff --git a/src/test/ui/print-stdout-eprint-stderr.rs b/src/test/ui/print-stdout-eprint-stderr.rs
deleted file mode 100644
index cfa9aec8068..00000000000
--- a/src/test/ui/print-stdout-eprint-stderr.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-// run-pass
-// ignore-emscripten spawning processes is not supported
-// ignore-sgx no processes
-
-use std::{env, process};
-
-fn child() {
-    print!("[stdout 0]");
-    print!("[stdout {}]", 1);
-    println!("[stdout {}]", 2);
-    println!();
-    eprint!("[stderr 0]");
-    eprint!("[stderr {}]", 1);
-    eprintln!("[stderr {}]", 2);
-    eprintln!();
-}
-
-fn parent() {
-    let this = env::args().next().unwrap();
-    let output = process::Command::new(this).arg("-").output().unwrap();
-    assert!(output.status.success());
-
-    let stdout = String::from_utf8(output.stdout).unwrap();
-    let stderr = String::from_utf8(output.stderr).unwrap();
-
-    assert_eq!(stdout, "[stdout 0][stdout 1][stdout 2]\n\n");
-    assert_eq!(stderr, "[stderr 0][stderr 1][stderr 2]\n\n");
-}
-
-fn main() {
-    if env::args().count() == 2 { child() } else { parent() }
-}