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, 26 deletions

diff --git a/src/test/ui/array-slice-vec/suggest-array-length.fixed b/src/test/ui/array-slice-vec/suggest-array-length.fixed
deleted file mode 100644
index 867c18a7d5e..00000000000
--- a/src/test/ui/array-slice-vec/suggest-array-length.fixed
+++ /dev/null
@@ -1,26 +0,0 @@
-// run-rustfix
-#![allow(unused_variables, dead_code, non_upper_case_globals)]
-
-fn main() {
-    const Foo: [i32; 3] = [1, 2, 3];
-    //~^ ERROR in expressions, `_` can only be used on the left-hand side of an assignment
-    //~| ERROR using `_` for array lengths is unstable
-    const REF_FOO: &[u8; 1] = &[1];
-    //~^ ERROR in expressions, `_` can only be used on the left-hand side of an assignment
-    //~| ERROR using `_` for array lengths is unstable
-    let foo: [i32; 3] = [1, 2, 3];
-    //~^ ERROR in expressions, `_` can only be used on the left-hand side of an assignment
-    //~| ERROR using `_` for array lengths is unstable
-    let bar: [i32; 3] = [0; 3];
-    //~^ ERROR in expressions, `_` can only be used on the left-hand side of an assignment
-    //~| ERROR using `_` for array lengths is unstable
-    let ref_foo: &[i32; 3] = &[1, 2, 3];
-    //~^ ERROR in expressions, `_` can only be used on the left-hand side of an assignment
-    //~| ERROR using `_` for array lengths is unstable
-    let ref_bar: &[i32; 3] = &[0; 3];
-    //~^ ERROR in expressions, `_` can only be used on the left-hand side of an assignment
-    //~| ERROR using `_` for array lengths is unstable
-    let multiple_ref_foo: &&[i32; 3] = &&[1, 2, 3];
-    //~^ ERROR in expressions, `_` can only be used on the left-hand side of an assignment
-    //~| ERROR using `_` for array lengths is unstable
-}