feat(material/schematics): Switch custom theme schematic to use theme mixin instead of define-theme and add high contrast override mixins#29642

amysorto merged 1 commit intoangular:mainangular/components:mainfrom

amysorto:high-contrast-define-theme-schematicamysorto/components:high-contrast-define-theme-schematicCopy head branch name to clipboard