bug(scrolling): Opening dialog in window virtual scroll break scrolling

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

[cdk-virtual-scroll-viewport[scrollWindow]](https://material.angular.io/cdk/scrolling/api#CdkVirtualScrollableWindow) is empty when opening a `mat-dialog` if the window have been scrolled.

When the dialog is closed, everything returns to normal but the scroll is restored to top 0.

### Reproduction

Steps to reproduce:
1. Go to https://stackblitz.com/edit/angular-psylrc
2. Click on "open dialog" button of the 100th line

### Expected Behavior

The virtual scroll should not be influenced by dialog

### Actual Behavior

Virtual scroll container become empty and when the dialog is closed the items come back but the scroll is restored to 0

### Environment

- Angular: 15.0.2
- CDK/Material: 15.0.2
- Browser(s): any
- Operating System (e.g. Windows, macOS, Ubuntu): any

リンクされた StackBlitz の再現手順から始め、100 行目までスクロールした後の cdk-virtual-scroll-viewport[scrollWindow] と mat-dialog の相互作用を調査します。空の viewport とスクロール位置が 0 に復元される状態を再現し、その後、ダイアログを開いて閉じても、仮想スクロールの内容が元の位置に表示されたままになることを確認します。

索引モデルが issue の本文から書いたものです。