[Woo POS] Update POS menu item based on the latest design

[jaclync]

Part of #12779

Why

Now that we have the design for the POS menu item in p91TBi-beb-p2, we can update it in the app. Please note that more design updates might be coming based on the p2 comments, I added a subtask to #12779 to address them after the design is finalized.

How

• Two new icons were added, pointOfSaleImage from the asset, and playSquareImage from SF symbols
• The title, description, icon updates of the POS menu item are in HubMenuViewModel.PointOfSaleEntryPoint
• For the playSquareImage in the accessory view of the POS row, a new case of HubMenu.Row.Chevron enum was added to show a play button in the accessory view instead of a chevron as the default. Originally I wanted to make it a configuration per row, but the enum is currently fileprivate in the view file and I decided to keep the changes minimum

Testing instructions

Prerequisite: having a store eligible for POS

• Switch to a store in the prerequisite if needed
• Go to the Menu tab
• (If the POS row isn't shown yet) Turn on the feature switch in Menu > Settings > Experimental Features > POS, then revisit the Menu tab, if needed --> the POS row should look as in design

Screenshots

light	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.

[dangermattic]

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📲 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	pr12793-447140e
	Version	18.7
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	447140e
	App Center Build	WooCommerce - Prototype Builds #9155

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[bozidarsevo]

I was looking at other systems icons and thinking maybe "creditcard" or some of it variations would fit better? Play button maybe indicates more that some video or something will be started. This icon will be hard to define since we are starting a special mode and not just showing a basic screen (normal indicator). Hm...

[jaclync]

I'm a bit unsure about the credit card mention because cash is also supported, I saw your comment in p91TBi-beb-p2#comment-12153 and we can wait for the final design decision. There's a separate subtask in #12779 to make any design updates from the entry point p2.