Remove htmx (#37224)

Close #35059

Slightly improved the "fetch action" framework and started adding tests for it.

---------

Signed-off-by: silverwind <me@silverwind.io>
Co-authored-by: silverwind <me@silverwind.io>

web_src/js/vitest.setup.ts

@@ -1,14 +1,4 @@
-// Stub APIs not implemented by happy-dom but needed by dependencies
-// XPathEvaluator is used by htmx at module evaluation time
-// TODO: Remove after https://github.com/capricorn86/happy-dom/pull/2103 is released
-if (!globalThis.XPathEvaluator) {
-  globalThis.XPathEvaluator = class {
-    createExpression() { return {evaluate: () => ({iterateNext: () => null})} }
-  } as any;
-}
-
-// Dynamic import so polyfills above are applied before htmx evaluates
-await import('./globals.ts');
+import './globals.ts';
 
 window.config = {
   appUrl: 'http://localhost:3000/',