Replace Red Hat color tokens with PatternFly v4 global tokens in pf-select

[bennypowers]

Description

The pf-select and pf-option components are using Red Hat color tokens (--rh-color-*) instead of PatternFly v4 global color tokens.

Current Usage

Found in rg '\-\-rh-color-gray':

elements/pf-select/pf-select.css:8

--_pf-option-selected-background-color: var(--rh-color-gray-20, #e0e0e0);

elements/pf-select/pf-option.css:18

background-color: var(--_pf-option-selected-background-color, var(--rh-color-gray-20, #e0e0e0));

Expected

These should use PatternFly v4 global color tokens instead, provided they meet contrast requirements. For example, tokens like:

• --pf-global--BackgroundColor--*
• --pf-global--palette--black-*

Impact

This affects the selected option background color in the select component.

Color Reference

Current fallback value: #e0e0e0 (light gray)