Add tests for source code with invalid utf-8 bytes

```
error: couldn't read `$DIR/not-utf8-bin-file.rs`: stream did not contain valid UTF-8
  --> $DIR/not-utf8-2.rs:6:5
   |
LL |     include!("not-utf8-bin-file.rs");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: byte `193` is not valid utf-8
  --> $DIR/not-utf8-bin-file.rs:2:14
   |
LL |     let _ = "�|�␂!5�cc␕␂��";
   |              ^
   = note: this error originates in the macro `include` (in Nightly builds, run with -Z macro-backtrace for more info)
```

CC rust-lang#76869, rust-lang#135557.

Author: estebank

tests/ui/macros/not-utf8-2.rs

@@ -0,0 +1,7 @@
+//@ error-pattern: did not contain valid UTF-8
+//@ reference: input.encoding.utf8
+//@ reference: input.encoding.invalid
+
+fn foo() {
+    include!("not-utf8-bin-file.rs");
+}

tests/ui/macros/not-utf8-2.stderr

@@ -0,0 +1,15 @@
+error: couldn't read `$DIR/not-utf8-bin-file.rs`: stream did not contain valid UTF-8
+  --> $DIR/not-utf8-2.rs:6:5
+   |
+LL |     include!("not-utf8-bin-file.rs");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+note: byte `193` is not valid utf-8
+  --> $DIR/not-utf8-bin-file.rs:2:14
+   |
+LL |     let _ = "�|�␂!5�cc␕␂��";
+   |              ^
+   = note: this error originates in the macro `include` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to 1 previous error
+

tests/ui/macros/not-utf8-bin-file.rs

@@ -0,0 +1,4 @@
+fn main() {
+    let _ = "Á|Õ!5¢ccŒÓ";
+    //~^ ERROR stream did not contain valid UTF-8
+}

tests/ui/macros/not-utf8-bin-file.stderr

@@ -0,0 +1,8 @@
+error: couldn't read `$DIR/not-utf8-bin-file.rs`: stream did not contain valid UTF-8
+  --> $DIR/not-utf8-bin-file.rs:2:14
+   |
+LL |     let _ = "�|�␂!5�cc␕␂��";
+   |              ^ byte `193` is not valid utf-8
+
+error: aborting due to 1 previous error
+