[App size reduction] Optimize login-related, Blaze, and empty store assets

[iamgabrielma]

Part of WOOMOB-534

Description

In this PR we switch several assets for their optimized versions, so we can reduce the data binaries

Looping in Kiwi as are mostly related to login, blaze, and store selection, with a side quest for taxes:

Testing information

• Case 1: Log out, and attempt to log in via site credentials. Observe that the views look the same.

Logged out	Login via site credentials

• Case 2: Blaze intro (not quite sure how to trigger this case, just confirmed in preview)

Before	After

Case 3: Woo store selection

I couldn't find the actual case where this is trigger. It should happen during the authentication process, when you're already logged into a WooCommerce store, but you have no WooCommerce stores (?) . It would seem is legacy code from a previous authentication flow but this is no longer possible, so if that's the case we could remove the whole thing rather than just updating the assets, which can be done on a separate PR. In any case, I've confirmed that the assets look the same in /Assets, just couldn't trigger the actual case in-app.

Case 4: Tax rates

• Go to Orders > Add a product to your order > tap on Set New tax rate. If no tax rates are set up in wp-admin you'll see this screen. If some are already set up please remove them or switch the case just for testing in NewTaxRateSelectorView.viewModel.syncState.empty

No tax rates light	No tax rates dark

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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.

[wpmobilebot]

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

	App Name	WooCommerce iOS Prototype
	Build Number	pr15881-f593fff
	Version	22.8
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	f593fff
	Installation URL	6mpcvlrehk9ho

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