bug(cdkMenu): cdkMenu is scrolled down when max-height is set

### 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

When using max-height on cdkMenu with overflow-y: auto, menu is scrolled down a bit when first shown.
Bad:
Good:

### Reproduction

StackBlitz link: https://stackblitz.com/edit/gbirs4?file=src/example/cdk-menu-standalone-menu-example.html,src/example/cdk-menu-standalone-menu-example.css
Steps to reproduce:
1. Add cdk menu with options with at least one cdkMenuHeaderItem.
2. Set max-height on cdkMenu.
3. Open menu.

### Expected Behavior

Menu should not be scrolled at all.

### Actual Behavior

Menu is scrolled a bit down.

### Environment

- Angular: 18.2.2
- CDK/Material: 18.2.2
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): macOS

Reproduce the issue using the StackBlitz example, starting with src/example/cdk-menu-standalone-menu-example.html and src/example/cdk-menu-standalone-menu-example.css. Check the cdkMenu with a cdkMenuHeaderItem and max-height plus overflow-y: auto; done means the menu opens without any initial scroll offset.

Written by the indexing model from the issue text.