fix(EMI-2053): Hide register by signal on auction screen

[MrSltun]

This PR resolves EMI-2053

Description

This PR hides the Register By signal on the auction screen
it also fixes an issue with the data where some auctions have undefined as a price in rails

Screenshots

Register By signal fix

	Before	After
Android
iOS

undefined issue

Before	After

PR Checklist

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

• hide Register By signal on Auction screen + fix undefined on auction artwork rail cards - mrsltun

iOS user-facing changes

Android user-facing changes

Dev changes

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[ArtsyOpenSource]

This PR contains the following changes:

• Cross-platform user-facing changes (hide Register By signal on Auction screen + fix undefined on auction artwork rail cards - mrsltun)

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