chore: Remove sub-copy from Artwork Saved tooltip for auction lots

This PR resolves https://artsyproduct.atlassian.net/browse/EMI-1976

My first PR in Eigen so please excuse my mistakes here. Figuring out this Eigen flow!

Description

Ideally we would have the auction saves(watches) go into a different list type but that is not done this way now. We are relying on checking if the artwork is in the auction for handling those saves in several places. So for now just reading this attribute from artwork and basing the sub-copy on that parameter.

Before:

After:

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 - Removed misleading sub-note after auction artwork save - oxaudo #### iOS user-facing changes - #### Android user-facing changes - #### Dev changes -

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artsy / eigen