feat: Run border width and radius CSS transitions on Core Animation

[MatiPl01]

Summary

Stacked on #9656.

Adds borderWidth and borderRadius to the platform-routed CSS transition properties (behind IOS_CSS_CORE_ANIMATION). borderRadius maps to CALayer's cornerRadius keypath (apply and remove paths).

Both properties route only while RN uses Core Animation border rendering for the view; views drawn through RN's rasterized border path keep transitioning on the loop, which redraws the border every frame.

Test plan

• -fsyntax-only compile check, clang-format clean
• Needs device verification with the IOS_CSS_CORE_ANIMATION flag enabled

[MatiPl01]

Superseded by #9689, which routes borderWidth and borderRadius (and the background/border colors) on top of the merged #9654. The border eligibility condition will land in a separate eligibility follow-up. Closing in favor of #9689.