Color system updates (#1272)

Author: danielguillan

.changeset/swift-crystal-meadow.md

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+---
+'@primer/react-brand': minor
+'@primer/brand-primitives': minor
+---
+
+Updated all base color scales and functional tokens.
+
+#### Design token updates
+
+- Updated all 13 base color scale palettes (`gray`, `blue`, `green`, `yellow`, `orange`, `red`, `purple`, `pink`, `coral`, `lemon`, `lime`, `teal`, `indigo`) in both light and dark modes
+- Updated `black-0` from `#1f2328` to `#000000` in both light and dark modes
+- Updated functional design tokens: `--brand-color-text-default`, `--brand-color-text-muted`, `--brand-color-border-default`, `--brand-color-border-subtle`, `--brand-color-border-muted`, `--brand-color-success-fg`, `--brand-color-success-emphasis`, `--brand-color-accent-primary`, and all hardcoded alpha tokens (`--brand-color-success-muted`, `--brand-color-error-muted`, `--brand-color-neutral-muted`, `--brand-color-neutral-subtle`)
+- Added new functional design tokens: `--brand-color-text-emphasized`, `--brand-color-text-link-rest`, `--brand-color-text-link-pressed`, `--brand-color-text-danger`, `--brand-color-danger-fg`, `--brand-color-danger-emphasis`, `--brand-color-danger-muted`, `--brand-color-danger-subtle`, `--brand-color-canvas-muted`
+- ⚠️ Deprecated `--brand-color-error-*` and `--brand-color-text-error` tokens, which are now aliased to the new `--brand-color-danger-*` and `--brand-color-text-danger` equivalents and will be removed in the future
+- ⚠️ Deprecated `--brand-color-text-subtle`, which is now remapped to the same value as `--brand-color-text-muted` and will be removed in the future
+- Updated `--brand-InlineLink-color-rest` and `--brand-InlineLink-color-pressed` to reference the new `--brand-color-text-link-rest` and `--brand-color-text-link-pressed` functional tokens
+- Updated `--brand-Link-color-accent` to reference the new `--brand-color-text-link-rest` functional token