[Brand Updates] Watch app

[hichamboushaba]

Closes: woocommerce/woomobile-private#407

Description

This PR updates the Watch app to use the new color palette, to do so, I updated the WooFoundationWatch library to include the shared color palette in addition to the ColorStudio helpers.

Steps to reproduce

1. Launch the app on a watch (or its simulator)
2. Check the MyStore screen, the Order List, and order details.

Testing information

Confirm the UI matches the new brand.

Tested using Watch Series 9 simulator, WatchOS 11.0

Screenshots

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on all devices (phone/tablet) and no regressions are addedhttps://github.com/woocommerce/woomobile-private/issues/407

[hichamboushaba]

I extracted this class from the UIColor+ColorStudio because some of the constructors used in it are not available in watchOS.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS
	Build Number	pr14803-bcf8050
	Version	21.2
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	bcf8050
	App Center Build	WooCommerce - Prototype Builds #12368

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[itsmeichigo]

Tested on simulator watch series 10 and confirmed that the colors match the new branding.