[analysis_server] Dot shorthands: Call hierarchy changes and tests.

Added work and tests needed for the call hierarchy to handle dot shorthands.

The element locator needed to be updated for the call hierarchy to work, so I updated that too.

Unit tests passing.

Bug: #59836
Change-Id: Id61e6071c5ff008300f7bd25f762a14f22e47595
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/431701
Reviewed-by: Paul Berry <[email protected]>
Commit-Queue: Kallen Tu <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>

Author: kallentu

pkg/analysis_server/lib/src/computer/computer_call_hierarchy.dart

@@ -468,6 +468,26 @@ class _OutboundCallVisitor extends RecursiveAstVisitor<void> {
     super.visitConstructorName(node);
   }
 
+  @override
+  void visitDotShorthandConstructorInvocation(
+    DotShorthandConstructorInvocation node,
+  ) {
+    collect(node.constructorName);
+    super.visitDotShorthandConstructorInvocation(node);
+  }
+
+  @override
+  void visitDotShorthandInvocation(DotShorthandInvocation node) {
+    collect(node.memberName);
+    super.visitDotShorthandInvocation(node);
+  }
+
+  @override
+  void visitDotShorthandPropertyAccess(DotShorthandPropertyAccess node) {
+    collect(node.propertyName);
+    super.visitDotShorthandPropertyAccess(node);
+  }
+
   @override
   void visitFunctionDeclaration(FunctionDeclaration node) {
     // Only descend into function declarations if they are the target/root