refactor(core): remove outline plugin and layout atom (#5326)

@affine/outline is no longer used, this PR deletes this plugin and deletes the code that is no longer used

tests/affine-cloud/e2e/collaboration.spec.ts

@@ -236,7 +236,8 @@ test('can sync svg between different browsers', async ({ page, browser }) => {
   const image = page.locator('affine-image');
 
   page.evaluate(async () => {
-    window.showOpenFilePicker = undefined;
+    // https://github.com/toeverything/blocksuite/blob/master/packages/blocks/src/_common/utils/filesys.ts#L20
+    (window as any).showOpenFilePicker = undefined;
   });
 
   const title = getBlockSuiteEditorTitle(page);

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

@@ -26,7 +26,6 @@ test('plugin should exist', async ({ page }) => {
     '@affine/hello-world-plugin',
     '@affine/image-preview-plugin',
     '@affine/vue-hello-world-plugin',
-    '@affine/outline-plugin',
   ];
   expect(packageJson).toEqual(
     plugins