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/enum/enum-to-float-cast.stderr b/tests/ui/enum/enum-to-float-cast.stderr
new file mode 100644
index 00000000000..191606d8dc5
--- /dev/null
+++ b/tests/ui/enum/enum-to-float-cast.stderr
@@ -0,0 +1,19 @@
+error[E0606]: casting `E` as `f32` is invalid
+  --> $DIR/enum-to-float-cast.rs:13:18
+   |
+LL | static C0: f32 = E::L0 as f32;
+   |                  ^^^^^^^^^^^^
+   |
+   = help: cast through an integer first
+
+error[E0606]: casting `F` as `f32` is invalid
+  --> $DIR/enum-to-float-cast.rs:14:18
+   |
+LL | static C1: f32 = F::H1 as f32;
+   |                  ^^^^^^^^^^^^
+   |
+   = help: cast through an integer first
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0606`.