Silencing "let expressions in this position are experimental" errors in case of misplaced parantheses in if let expression

[atsuzaki]

Follow-up to #82827, cc: @estebank

Given the following code: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=7810898a8a0c0b5d421b4efbd58a4ff8

pub fn main() {
  let x = Some(3);
  if (let Some(y) = x) {
    println!("{}", y)
  } else {
    println!("None")
  }
}

The current output is:

error[E0658]: `let` expressions in this position are experimental
 --> src/main.rs:3:7
  |
3 |   if (let Some(y) = x) {
  |       ^^^^^^^^^^^^^^^
  |
  = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
  = help: add `#![feature(let_chains)]` to the crate attributes to enable
  = help: you can write `matches!(<expr>, <pattern>)` instead of `let <pattern> = <expr>`

error: invalid parentheses around `let` expression in `if let`
 --> src/main.rs:3:6
  |
3 |   if (let Some(y) = x) {
  |      ^               ^
  |
help: `if let` needs to be written without parentheses
  |
3 |   if let Some(y) = x {
  |     --             --

error: aborting due to 2 previous errors

Ideally the output should look like:
(Just the invalid parantheses error, and the let expressions in this position is experimental error is silenced)

error: invalid parentheses around `let` expression in `if let`
 --> src/main.rs:3:6
  |
3 |   if (let Some(y) = x) {
  |      ^               ^
  |
help: `if let` needs to be written without parentheses
  |
3 |   if let Some(y) = x {
  |     --             --

error: aborting due to 2 previous errors

[osa1]

@rustbot claim

[dtolnay]

@rustbot release-assignment

[c410-f3r]

The help note is not showed anymore so this issue can probably be closed