refactor: move utils and cleanup test helpers (#10261)

blocksuite/affine/shared/src/utils/dom/has-classname-in-list.ts

@@ -0,0 +1,6 @@
+/**
+ * Return `true` if the element has class name in the class list.
+ */
+export function hasClassNameInList(element: Element, classList: string[]) {
+  return classList.some(className => element.classList.contains(className));
+}

blocksuite/affine/shared/src/utils/dom/index.ts

@@ -1,4 +1,5 @@
 export * from './checker.js';
+export * from './has-classname-in-list.js';
 export * from './point-to-block.js';
 export * from './point-to-range.js';
 export * from './query.js';