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, 19 insertions, 0 deletions

diff --git a/tests/ui/for-loop-while/foreach-external-iterators-hashmap.rs b/tests/ui/for-loop-while/foreach-external-iterators-hashmap.rs
new file mode 100644
index 00000000000..9f2ca05cdb6
--- /dev/null
+++ b/tests/ui/for-loop-while/foreach-external-iterators-hashmap.rs
@@ -0,0 +1,19 @@
+// run-pass
+
+use std::collections::HashMap;
+
+pub fn main() {
+    let mut h = HashMap::new();
+    let kvs = [(1, 10), (2, 20), (3, 30)];
+    for &(k,v) in &kvs {
+        h.insert(k,v);
+    }
+    let mut x = 0;
+    let mut y = 0;
+    for (&k,&v) in &h {
+        x += k;
+        y += v;
+    }
+    assert_eq!(x, 6);
+    assert_eq!(y, 60);
+}