[iOS] Align Bling colors with shared palette

This change updates feature-specific colors in
ios/chrome/browser/toolbar/ui_bundled to align with the shared Bling
color system, improving code health and design consistency. Existing
color definitions will be replaced with their shared Bling palette
equivalents to ensure uniformity across features.

For more details, refer to go/bling-colors-technical-assessment.

This CL was uploaded by git cl split.

R=rohitrao@chromium.org

Bug: 392058581
Fixed: 392106623
Change-Id: Ifb542462b9d84ec1b52861cc4efd03cedce98605
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6197383
Auto-Submit: Benjamin Williams <bwwilliams@google.com>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1411821}