remove unstable const_type_id feature

Author: KodrAus

src/test/ui/consts/issue-73976-monomorphic.rs

@@ -5,7 +5,6 @@
 // will be properly rejected. This test will ensure that monomorphic use of these
 // would not be wrongly rejected in patterns.
 
-#![feature(const_type_id)]
 #![feature(const_type_name)]
 
 use std::any::{self, TypeId};

src/test/ui/consts/issue-73976-polymorphic.rs

@@ -5,7 +5,6 @@
 // This test case should either run-pass or be rejected at compile time.
 // Currently we just disallow this usage and require pattern is monomorphic.
 
-#![feature(const_type_id)]
 #![feature(const_type_name)]
 
 use std::any::{self, TypeId};