Improve AppSearchModal tap indication

[gert-janvercauteren]

App search modal

• Add tap indication when tapping on a result (canvas contrast)
• Ensure chips scroll edge to edge on iOS 17. For lower versions we stay on the 'padded' version as before.

https://github.com/Skyscanner/backpack-ios/assets/728889/d2734fb0-a420-4db3-9b33-7461c7981994

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