Hide obvious suggestion from cli output

src/librustc_resolve/lib.rs

@@ -5112,7 +5112,7 @@ fn add_suggestion_for_duplicate_nested_use(
                         // extra for the comma.
                         span.lo().0 - (prev_comma.as_bytes().len() as u32) - 1
                     ));
-                    err.span_suggestion(
+                    err.tool_only_span_suggestion(
                         span, message, String::new(), Applicability::MaybeIncorrect,
                     );
                     return;

src/test/ui/error-codes/E0430.stderr

@@ -10,10 +10,8 @@ error[E0252]: the name `fmt` is defined multiple times
   --> $DIR/E0430.rs:1:22
    |
 LL | use std::fmt::{self, self};
-   |                ------^^^^
-   |                |   | |
-   |                |   | `fmt` reimported here
-   |                |   help: remove unnecessary import
+   |                ----  ^^^^ `fmt` reimported here
+   |                |
    |                previous import of the module `fmt` here
    |
    = note: `fmt` must be defined only once in the type namespace of this module

src/test/ui/issues/issue-45829/import-twice.stderr

@@ -2,10 +2,8 @@ error[E0252]: the name `A` is defined multiple times
   --> $DIR/import-twice.rs:6:14
    |
 LL | use foo::{A, A};
-   |           ---^
-   |           || |
-   |           || `A` reimported here
-   |           |help: remove unnecessary import
+   |           -  ^ `A` reimported here
+   |           |
    |           previous import of the type `A` here
    |
    = note: `A` must be defined only once in the type namespace of this module

src/test/ui/issues/issue-52891.stderr

@@ -44,10 +44,7 @@ LL | use issue_52891::a;
    |     -------------- previous import of the module `a` here
 ...
 LL | use issue_52891::{f, g, a};
-   |                       --^
-   |                       | |
-   |                       | `a` reimported here
-   |                       help: remove unnecessary import
+   |                         ^ `a` reimported here
    |
    = note: `a` must be defined only once in the type namespace of this module
 
@@ -82,16 +79,11 @@ LL |     a,
 error[E0252]: the name `a` is defined multiple times
   --> $DIR/issue-52891.rs:26:5
    |
-LL |   use issue_52891::a;
-   |       -------------- previous import of the module `a` here
+LL | use issue_52891::a;
+   |     -------------- previous import of the module `a` here
 ...
-LL |       m,
-   |  ______-
-LL | |     a};
-   | |     ^
-   | |     |
-   | |_____`a` reimported here
-   |       help: remove unnecessary import
+LL |     a};
+   |     ^ `a` reimported here
    |
    = note: `a` must be defined only once in the type namespace of this module