Rust: Complete path-independent element strings

Add the AsmLabel string implementation and avoid requiring a resolved constant name when rendering Const.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: hvitved

rust/ql/.generated.list

@@ -1,4 +1,3 @@
-// generated by codegen, remove this comment if you wish to edit this file
 /**
  * This module provides a hand-modifiable wrapper around the generated class `AsmLabel`.
  *
@@ -12,6 +11,7 @@ private import codeql.rust.elements.internal.generated.AsmLabel
  * be referenced directly.
  */
 module Impl {
+  // the following QLdoc is generated: if you need to edit it, do it in the schema file
   /**
    * A label in an inline assembly block.
    *
@@ -25,5 +25,7 @@ module Impl {
    * );
    * ```
    */
-  class AsmLabel extends Generated::AsmLabel { }
+  class AsmLabel extends Generated::AsmLabel {
+    override string toStringImpl() { result = this.getAPrimaryQlClass() }
+  }
 }

rust/ql/.gitattributes

@@ -28,7 +28,7 @@ module Impl {
     /** Gets an access to this constant item. */
     ConstAccess getAnAccess() { this = result.getConst() }
 
-    override string toStringImpl() { result = "const " + this.getName().getText() }
+    override string toStringImpl() { result = "const " + concat(this.getName().getText()) }
   }
 
   /**