bug(drag-drop): Draggable elements inside SVG DropList not spawning underneath cursor

#### Reproduction

Use StackBlitz to reproduce your issue:
- Components: https://stackblitz.com/fork/components-issue
- Harnesses: https://stackblitz.com/fork/harness-issue

Steps to reproduce:
1. Go to either https://stackblitz.com/edit/angular-droplist-with-previewcontainer?file=src/app/app.component.html
or https://stackblitz.com/edit/angular-droplist-without-previewcontainer?file=src/app/app.component.html
2. Drag the "Test" element to the other droplist
3. Release LMB


#### Expected Behavior

In both cases I would expect the "Preview" element to spawn next to the mouse cursor and to be dropped on the droplist under the cursor.

#### Actual Behavior

In the first example "with-previewcontainer" I use the `cdkPreviewContainer` attribute to spawn the "Preview" element inside the parent svg, in that case it spawns correctly, but the drop is offset. By moving the mouse cursor somewhere towards the bottom right of the page, the "Test" element can be seen moving to the other droplist.

In the second example "without-previewcontainer" the `cdkPreviewContainer` is omitted and the "Preview" element spawn at the top left of the page. The offset from the top left seems to correlate with the offset of the mouse cursor inside the droplist. Moving the mosue cursor far enough down and to the right will again make the "Test" element move to the other droplist.

The behaviour in Firefox seems to be slightly different.

#### Environment

- Angular: 12.2.6
- CDK/Material: 12.2.5
- Browser(s): Edge 93.0.961.52, Chrome 93.0.4577.82, Brave 1.29.81, Firefox 92.0.1
- Operating System (e.g. Windows, macOS, Ubuntu): Windows 10

首先运行链接的两个 StackBlitz 复现示例，并检查 src/app/app.component.html，对比 cdkPreviewContainer 和 omitted-container 两种情况。完成的标准是：在两个 SVG 示例中，预览显示在光标旁边，并且元素被放置到光标下方的下拉列表中，同时包括所描述的浏览器行为。

由索引模型根据 Issue 内容生成。