Remove auxiliaryButtonImage from CardPresentModalScanningForReader

[iamgabrielma]

Reported on #8312 (comment)

Description

This PR removes the auxiliaryButtonimage property from CardPresentModalScanningForReader which outputs a (¡) image along the button's text on different modal views through the CardPresent flow.

Context

With the usage of the new UIButton configuration API we have found some conflicts in the way we're dealing with button content configuration through this flow, in this case we have opted for removing the image temporarily as was the source of different design glitches.

We have opened a related issue to keep track of it, and restore the image in the future, when we migrate the modals to SwiftUI and apply the new button configuration API.

Before	After

Before	After

Changes

• Remove auxiliaryButtonimage property
• Add usage of UIButton.Configuration when styling the button

Testing instructions

• Go to Menu > Manage Card Reader > Disconnect the reader if is connected > Tap on Connect Card Reader
• See Learn More about In-Person Payments button. This is more easily checked by commenting out discoveredReadersSubject.send(wooReaders) here, so the flow doesn't move forward to the next step.
• See Cancel button when the app prompts to connect a reader.

I'd left out of this PR further improvements like moving button title and attributedTitle to the button configuration because this needs more extensive testing. These are left to be done along this issue.

[wpmobilebot]

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• Then installing the build number pr8333-79c7f66 on your iPhone

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