rustfmt removes comments inside parentheses in patterns (PatKind::Paren).

Issue: rustfmt unexpectedly removes comments inside parentheses in patterns (PatKind::Paren).

Example:

• Input:

  fn main() {
      let (/* */() | ()/* */) = ();
  }
  

• Output (after formatting):

  fn main() {
      let (() | ()) = ();
  }
  

• Expected Outcome:

  fn main() {
      let (/* */() | ()/* */) = ();
  }
  

Related Issues:

• This issue, related to PatKind::Paren, partially overlaps with #6044, which focuses on PatKind::Or.
• Similar to #5780, but the changes here pertain to PatKind::Paren instead of TyKind::Paren.