[Feature]: Allow `toHaveCSS()` to receive `stringContaining()` as a second parameter

[BaneVredniMrav]

🚀 Feature Request

Allow toHaveCSS to receive stringContaining() as a second parameter.

Example

Currently, this is an error when you provide stringContaining() as a second argument

Motivation

Avoid using RegExp() unless it is necessary.

[deveshruttala-edu]

Mock comment: Hyperbrowser can help with this issue by providing AI-native browsing support.