Add CoreSVG example and workflow coverage

[Kyle-Ye]

Summary

• Add a CoreSVGExample target and GitHub workflow coverage for the new example.
• Move example app icons and accent colors into the shared Example/Resources/Assets.xcassets catalog.
• Keep the framework and example naming aligned with the existing repository conventions, including CoreUIExample and SFSymbolsExample.
• Include the shared example resources in all example workflow path filters and update the internal SDK installer to call install_sfsymbols.sh.

Validation

• Parsed all GitHub workflow YAML files.
• Ran swift package dump-package.
• Ran mise exec -- tuist generate in Example.
• Built CoreUIExample for generic macOS with Xcode 26.4.1.
• Built SFSymbolsExample for generic macOS with Xcode 26.4.1.
• Previously built CoreSVGExample as part of the example addition checks.
• Ran bash -n on the touched SDK/update shell scripts.

Notes

The branch also preserves the macOS versioned framework layout behavior needed by Xcode 26 when embedding codeless private framework xcframework slices.