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, 34 deletions

diff --git a/src/test/ui/specialization/defaultimpl/specialization-trait-item-not-implemented-rpass.rs b/src/test/ui/specialization/defaultimpl/specialization-trait-item-not-implemented-rpass.rs
deleted file mode 100644
index 89fef5b5ef9..00000000000
--- a/src/test/ui/specialization/defaultimpl/specialization-trait-item-not-implemented-rpass.rs
+++ /dev/null
@@ -1,34 +0,0 @@
-// run-pass
-
-// Tests that we can combine a default impl that supplies one method with a
-// full impl that supplies the other, and they can invoke one another.
-
-#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
-
-trait Foo {
-    fn foo_one(&self) -> &'static str;
-    fn foo_two(&self) -> &'static str;
-    fn foo_three(&self) -> &'static str;
-}
-
-struct MyStruct;
-
-default impl<T> Foo for T {
-    fn foo_one(&self) -> &'static str {
-        self.foo_three()
-    }
-}
-
-impl Foo for MyStruct {
-    fn foo_two(&self) -> &'static str {
-        self.foo_one()
-    }
-
-    fn foo_three(&self) -> &'static str {
-        "generic"
-    }
-}
-
-fn main() {
-    assert!(MyStruct.foo_two() == "generic");
-}