refactor: plugin loading logic (#3448)

tests/affine-plugin/e2e/basic.spec.ts

@@ -0,0 +1,31 @@
+import { test } from '@affine-test/kit/playwright';
+import { openHomePage } from '@affine-test/kit/utils/load-page';
+import { waitEditorLoad } from '@affine-test/kit/utils/page-logic';
+import { expect } from '@playwright/test';
+
+test('plugin should exist', async ({ page }) => {
+  await openHomePage(page);
+  await waitEditorLoad(page);
+  await page.route('**/plugins/**/package.json', route => route.fetch(), {
+    times: 3,
+  });
+  await page.waitForTimeout(50);
+  const packageJson = await page.evaluate(() => {
+    // @ts-expect-error
+    return window.__pluginPackageJson__;
+  });
+  expect(packageJson).toEqual([
+    {
+      name: '@affine/bookmark-plugin',
+      affinePlugin: expect.anything(),
+    },
+    {
+      name: '@affine/copilot-plugin',
+      affinePlugin: expect.anything(),
+    },
+    {
+      name: '@affine/hello-world-plugin',
+      affinePlugin: expect.anything(),
+    },
+  ]);
+});