refactor: align component check with ember-cli#2724 canonical (lists + scope)

Replace the inline PascalCase-regex isComponentInvocation heuristic with
the lists + scope pattern established by @NullVoxPopuli in ember-cli#2689 and
canonicalised by ember-cli#2724. The new lib/utils/is-native-element.js mirrors
without conflict — whichever lands first introduces the file; the other
rebases to a no-op on it.

Heuristic approaches (PascalCase regex, `tag.includes('.')`, etc.) were
explicitly rejected in ember-cli#2689 because lowercase tags CAN be components in
GJS/GTS when the name is shadowed by a scope binding
(`const div = MyComponent; <div />`). Scope analysis catches this;
regex heuristics don't.

Call site now uses `!isNativeElement(node, sourceCode)` directly to
match the canonical usage pattern in ember-cli#2724's migrated rules.

Author: johanrd

lib/rules/template-no-noninteractive-tabindex.js

@@ -1,5 +1,5 @@
 const { dom, roles } = require('aria-query');
-const { isComponentInvocation } = require('../utils/is-component-invocation');
+const { isNativeElement } = require('../utils/is-native-element');
 const { isNativeInteractive } = require('../utils/native-interactive-elements');
 
 // Interactive ARIA roles (widget/command/composite/input/range subtypes) —
@@ -100,18 +100,20 @@ module.exports = {
   },
 
   create(context) {
+    const sourceCode = context.sourceCode || context.getSourceCode();
     return {
       GlimmerElementNode(node) {
         const tabindex = findAttr(node, 'tabindex');
         if (!tabindex) {
           return;
         }
 
-        // Skip component invocations (PascalCase, named-arg, this-path,
-        // dot-path, named-block). Fixes the <Article tabindex={{0}}> FP where
-        // a PascalCase component name collided with a native tag after
+        // Only native HTML / SVG / MathML elements are in scope. Authoritative
+        // tag lists (html-tags + svg-tags + mathml-tag-names) plus scope-
+        // shadowing detection. Fixes the <Article tabindex={{0}}> FP where a
+        // PascalCase component name collided with a native tag after
         // lowercasing.
-        if (isComponentInvocation(node)) {
+        if (!isNativeElement(node, sourceCode)) {
           return;
         }