feat(EMI-2015): Add auction signals to artwork grid and rail components

[MrSltun]

This PR resolves EMI-2015

[!NOTE] The changes in this PR are hidden behind AREnableAuctionImprovementsSignals feature flag

Description

This PR adds new signals for auctioned artworks in Artwork Grid items and Artwork Rail cards

Screenshots and videos

Screenshots and Videos

	Android	iOS
Rail auction artwork
Rail with extended auctions
Grid with different timers
Grid with ending soon auctions
Watchers in Artwork Screen
Grid with extended auctions
Updating Lot Watchers

PR Checklist

• [x] I have tested my changes on iOS and Android.
• [x] I hid my changes behind a feature flag, or they don't need one.
• [x] I have included screenshots or videos, or I have not changed the UI.
• [x] I have added tests, or my changes don't require any.
• [x] I added an app state migration, or my changes do not require one.
• [x] I have documented any follow-up work that this PR will require, or it does not require any.
• [x] I have added a changelog entry below, or my changes do not require one.

To the reviewers 👀

• [ ] I would like at least one of the reviewers to run this PR on the simulator or device.

Changelog updates

Changelog updates

Cross-platform user-facing changes

• Add auction signals to artwork grid items and rail cards (behind ff AREnableAuctionImprovementsSignals) - mrsltun

iOS user-facing changes

Android user-facing changes

Dev changes

Need help with something? Have a look at our docs, or get in touch with us.

[ArtsyOpenSource]

This PR contains the following changes:

• Cross-platform user-facing changes (Add auction signals to artwork grid items and rail cards (behind ff AREnableAuctionImprovementsSignals) - mrsltun)

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