[Brand Updates] Update empty state for some Dashboard cards

[hichamboushaba]

Description

This PR updates the empty state UI of the following dashboard cards: Performance, Top performers Ntkk0ER4hHt5y9KjEGIiGk-fi-3167_7914.
It also updates the stock card empty illustration to match Android by using same empty illustration that we use in product list.

Steps to reproduce

1. Open the app.
2. Make sure that you enable the following cards: Performance, Top performers and stock.
3. Update the filter (or date range) to trigger empty states.

Testing information

Confirm the empty state illustration matches the new design.

Screenshots

Light	Dark

---

• 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	pr14798-07882e3
	Version	21.2
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	07882e3
	App Center Build	WooCommerce - Prototype Builds #12370

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

[itsmeichigo]

Tested on simulator iPhone 16 Pro iOS 18.2 and confirmed that the empty states of the Performance, Top Performers and Stock cards are updated as described.

One minor nit: I see that the empty state of the performance card doesn't have a divider above the "Last updated..." label while the top performers card does. Should we update either of the cards to make them consistent?

[hichamboushaba]

One minor nit: I see that the empty state of the performance card doesn't have a divider above the "Last updated..." label while the top performers card does. Should we update either of the cards to make them consistent?

Thanks @itsmeichigo for the review, yes, I noticed this as well, for now I'm trying to wrap the remaining work, so I left this as it was already like this before.