[Brand Updates] Update Jetpack setup illustrations in dark theme

[hichamboushaba]

Description

During the design review, it was commented that the illustrations we use for Jetpack setup flow don't look great in dark theme, so we got new versions that use lighter purple, this PR updates those illustrations:

Steps to reproduce

Checking the screenshots below should be enough.

Testing information

Tested on an iPhone 16 simulator, iOS 18.1.

Screenshots

Before	After

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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 added.

[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	pr14973-f19bea7
	Version	21.4
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	f19bea7
	App Center Build	WooCommerce - Prototype Builds #12690

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

[pmusolino]

LGTM!