feat(editor): make height of edgeless embed doc to fit content (#12089)

Close [BS-3388](https://linear.app/affine-design/issue/BS-3388/embed-doc-拖入后的初始高度不要超过800，不要限制用户随后的调整空间)

This PR impl a extension which initialize the height of added `affine-embed-edgeless-synced-doc-block` to fit its content

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Improved handling of embedded synced document block height to better fit content within edgeless mode.
- **Tests**
  - Added an end-to-end test to verify correct height adjustment for embedded synced documents in edgeless mode.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/embed-doc/src/embed-synced-doc-block/embed-synced-doc-spec.ts

@@ -5,6 +5,7 @@ import { literal } from 'lit/static-html.js';
 
 import { EmbedSyncedDocBlockAdapterExtensions } from './adapters/extension';
 import { createBuiltinToolbarConfigExtension } from './configs/toolbar';
+import { HeightInitializationExtension } from './init-height-extension';
 
 const flavour = EmbedSyncedDocBlockSchema.model.flavour;
 
@@ -27,4 +28,5 @@ export const EmbedSyncedDocViewExtensions: ExtensionType[] = [
       : literal`affine-embed-synced-doc-block`;
   }),
   createBuiltinToolbarConfigExtension(flavour),
+  HeightInitializationExtension,
 ].flat();