Update UI tests that generates duplicated result

Author: long-long-float

tests/ui/lifetimes/undeclared-lifetime-used-in-debug-macro-issue-70152.stderr

@@ -12,7 +12,6 @@ error[E0261]: use of undeclared lifetime name `'b`
 LL | #[derive(Eq, PartialEq)]
    |          -- lifetime `'b` is missing in item created through this procedural macro
 LL | struct Test {
-   |            - help: consider introducing lifetime `'b` here: `<'b>`
 LL |     a: &'b str,
    |         ^^ undeclared lifetime
 

tests/ui/pattern/usefulness/issue-119778-type-error-ice.stderr

@@ -14,11 +14,6 @@ error[E0425]: cannot find value `S` in this scope
    |
 LL |     struct Foo([u8; S]);
    |                     ^ not found in this scope
-   |
-help: you might be missing a const parameter
-   |
-LL |     struct Foo<const S: /* Type */>([u8; S]);
-   |               +++++++++++++++++++++
 
 error[E0658]: `impl Trait` in type aliases is unstable
   --> $DIR/issue-119778-type-error-ice.rs:9:14

tests/ui/traits/issue-50480.stderr

@@ -20,11 +20,6 @@ error[E0412]: cannot find type `N` in this scope
    |
 LL | struct Foo(N, NotDefined, <i32 as Iterator>::Item, Vec<i32>, String);
    |            ^ not found in this scope
-   |
-help: you might be missing a type parameter
-   |
-LL | struct Foo<N>(N, NotDefined, <i32 as Iterator>::Item, Vec<i32>, String);
-   |           +++
 
 error[E0412]: cannot find type `NotDefined` in this scope
   --> $DIR/issue-50480.rs:3:15