Bless ui-fulldeps tests

Co-authored-by: Adrian <[email protected]>

Author: Noratrieb

tests/ui-fulldeps/dropck-tarena-cycle-checked.stderr

@@ -11,6 +11,6 @@ LL | }
    | `arena` dropped here while still borrowed
    | borrow might be used here, when `arena` is dropped and runs the `Drop` code for type `TypedArena`
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0597`.

tests/ui-fulldeps/dropck-tarena-unsound-drop.stderr

@@ -11,6 +11,6 @@ LL | }
    | `arena` dropped here while still borrowed
    | borrow might be used here, when `arena` is dropped and runs the `Drop` code for type `TypedArena`
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0597`.

tests/ui-fulldeps/internal-lints/span_use_eq_ctxt.stderr

@@ -10,5 +10,5 @@ note: the lint level is defined here
 LL | #![deny(rustc::span_use_eq_ctxt)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 

tests/ui-fulldeps/pathless-extern-unstable.stderr

@@ -7,6 +7,6 @@ LL | pub use rustc_middle;
    = note: see issue #27812 <https://github.com/rust-lang/rust/issues/27812> for more information
    = help: add `#![feature(rustc_private)]` to the crate attributes to enable
 
-error: aborting due to previous error
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0658`.

tests/ui-fulldeps/session-diagnostic/enforce_slug_naming.stderr

@@ -7,5 +7,5 @@ LL | #[diag(compiletest_example, code = "E0123")]
    = note: slug is `compiletest_example` but the crate name is `rustc_dummy`
    = help: expected a slug starting with `dummy_...`
 
-error: aborting due to previous error
+error: aborting due to 1 previous error