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, 13 insertions, 0 deletions

diff --git a/tests/ui/panic-handler/panic-handler-std.stderr b/tests/ui/panic-handler/panic-handler-std.stderr
new file mode 100644
index 00000000000..7c7feffe76a
--- /dev/null
+++ b/tests/ui/panic-handler/panic-handler-std.stderr
@@ -0,0 +1,13 @@
+error[E0152]: found duplicate lang item `panic_impl`
+  --> $DIR/panic-handler-std.rs:8:1
+   |
+LL | fn panic(info: PanicInfo) -> ! {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: the lang item is first defined in crate `std` (which `panic_handler_std` depends on)
+   = note: first definition in `std` loaded from SYSROOT/libstd-*.rlib
+   = note: second definition in the local crate (`panic_handler_std`)
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0152`.