Auto merge of #25222 - pshaughn:node_isconnected, r=jdm

adding .isConnected DOM attribute

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is_connected already existed for this concept and just needed to be hooked up to an IDL attribute.

---
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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #25126

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- [X] There are tests for these changes OR

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components/script/dom/node.rs

@@ -2296,6 +2296,11 @@ impl NodeMethods for Node {
         USVString(String::from(self.owner_doc().base_url().as_str()))
     }
 
+    // https://dom.spec.whatwg.org/#dom-node-isconnected
+    fn IsConnected(&self) -> bool {
+        return self.is_connected();
+    }
+
     // https://dom.spec.whatwg.org/#dom-node-ownerdocument
     fn GetOwnerDocument(&self) -> Option<DomRoot<Document>> {
         match self.type_id() {

components/script/dom/webidls/Node.webidl

@@ -28,6 +28,9 @@ interface Node : EventTarget {
   [Pure]
   readonly attribute USVString baseURI;
 
+  [Pure]
+  readonly attribute boolean isConnected;
+
   [Pure]
   readonly attribute Document? ownerDocument;