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, 38 deletions

diff --git a/src/test/ui/process/multi-panic.rs b/src/test/ui/process/multi-panic.rs
deleted file mode 100644
index a1887c2180e..00000000000
--- a/src/test/ui/process/multi-panic.rs
+++ /dev/null
@@ -1,38 +0,0 @@
-// run-pass
-// ignore-emscripten no processes
-// ignore-sgx no processes
-// needs-unwind
-
-fn check_for_no_backtrace(test: std::process::Output) {
-    assert!(!test.status.success());
-    let err = String::from_utf8_lossy(&test.stderr);
-    let mut it = err.lines();
-
-    assert_eq!(it.next().map(|l| l.starts_with("thread '<unnamed>' panicked at")), Some(true));
-    assert_eq!(it.next(), Some("note: run with `RUST_BACKTRACE=1` \
-                                environment variable to display a backtrace"));
-    assert_eq!(it.next().map(|l| l.starts_with("thread 'main' panicked at")), Some(true));
-    assert_eq!(it.next(), None);
-}
-
-fn main() {
-    let args: Vec<String> = std::env::args().collect();
-    if args.len() > 1 && args[1] == "run_test" {
-        let _ = std::thread::spawn(|| {
-            panic!();
-        }).join();
-
-        panic!();
-    } else {
-        let test = std::process::Command::new(&args[0]).arg("run_test")
-                                                       .env_remove("RUST_BACKTRACE")
-                                                       .output()
-                                                       .unwrap();
-        check_for_no_backtrace(test);
-        let test = std::process::Command::new(&args[0]).arg("run_test")
-                                                       .env("RUST_BACKTRACE","0")
-                                                       .output()
-                                                       .unwrap();
-        check_for_no_backtrace(test);
-    }
-}