Use trait collection to resolve border colors

[danilobuerger]

Summary

c974cbf changed the border colors to be of UIColor instead of CGColor. This allowed working with dark mode to switch the border colors automatically. However, in certain situation the system can't resolve the current trait collection (see https://stackoverflow.com/a/57177411/2525941). This commit resolves the colors with the current trait collection to ensure the right colors are selected. This matches with the behavior of how the background color is resolved (also in displayLayer:).

Changelog

[iOS] [Fixed] - Resolve border platform color based on current trait collection

Test Plan

Same test plan as #29728

[pull-bot]

PR build artifact for 38d5f6b is ready.
To use, download tarball from "Artifacts" tab in this CircleCI job then run yarn add <path to tarball> in your React Native project.

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: f7a66e6
Branch: main

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,297,788	-2,614
android	hermes	armeabi-v7a	7,634,879	-4,063
android	hermes	x86	8,771,104	-4,744
android	hermes	x86_64	8,708,122	-4,635
android	jsc	arm64-v8a	9,783,593	-1,242
android	jsc	armeabi-v7a	8,768,874	-1,847
android	jsc	x86	9,749,504	-1,956
android	jsc	x86_64	10,345,405	-2,222

Base commit: 384e1a0
Branch: main

[facebook-github-bot]

@cortinico has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[cortinico]

For some reason CLANGFORMAT is flagging those lines:712, 730, 733

I'd say let's rebase this and verify if Circle CI is green. If is still green after the rebase and the internal job I can reformat it manually.

Also cc @sammy-SC for a iOS pass

[danilobuerger]

Hi @cortinico thanks for the review. I rebased it and amended the lines you mentioned. It looks like there were some whitespaces that the linter didn't agree with.

[facebook-github-bot]

@cortinico has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @danilobuerger in 9a35818.

^{When will my fix make it into a release? | Upcoming Releases}

[danilobuerger]

@cortinico Thank you for taking care of my outstanding PRs. I really do appreciate it.

[cortinico]

@cortinico Thank you for taking care of my outstanding PRs. I really do appreciate it.

Sorry those fell through the cracks 👍 Glad we got to merge them though!