bug(Theming): Unable to create a theme with CSS variables after v15 update

[tutkli]

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

14

Description

In v14 you could create a Material Theme dinamically by defining the palettes with CSS variables and later assign a color value to those variables. This is no longer possible in v15.

Reproduction

Check this Stackblitz: https://stackblitz.com/edit/components-issue-ml4ejy

Steps to reproduce:
Define a palette with CSS variables
Set CSS variable values in component

Expected Behavior

Ability to assign CSS variables values when defining a palette.

Actual Behavior

You can't define a theme with CSS variables.

Environment

• Angular: 15.0.0
• CDK/Material: 15.0.0
• Browser(s): All
• Operating System (e.g. Windows, macOS, Ubuntu): All

[crisbeto]

Duplicate of #25981.

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