bug(mat-form-field): form field with mat-label and without mat-label not vertically aligned

### Is this a regression?

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

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

14

### Description

When two mat-form-fields are in a div and one has a mat-label while the other one hasn't, the fields are not aligned vertically.

The `display` property on `.mat-form-field` was changed from `inline-block` to `inline-flex`. Changing it back seems to solve the issue.

### Reproduction

https://stackblitz.com/edit/cjzlva?file=src%2Fapp%2Fform-field-overview-example.html

### Expected Behavior

Form fields are aligned vertically

### Actual Behavior

Forms fields are not aligned

### Environment

- Angular: 15.2.9 / 16.0.1
- CDK/Material: 15.2.9 / 16.0.1
- Browser(s): Chrome 113 / FireFox 113
- Operating System (e.g. Windows, macOS, Ubuntu): Windows

Open the linked StackBlitz reproduction and compare the two mat-form-fields, then inspect the .mat-form-field display rule changed from inline-block to inline-flex. Confirm the fix by checking that fields with and without mat-label align vertically in the reported Angular Material versions and browsers.

Written by the indexing model from the issue text.