Check if our `imageWithTintColor(_:)` implementation overlaps Apple's `withTintColor(_:)` and could be removed

[iamgabrielma]

From #8139 (comment)

We have some references to the WordPressUI function imageWithTintColor, which returns an optional, hence the force unwrapping. I didn't change those, because I didn't know if by doing so we would get any unexpected change (imageWithTintColor has its own implementation that might differ from Apple's). Because of that, I think creating a new issue to check on those is the right course of action here.

[peril-woocommerce]

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