Simplify swapper error monads

[woodenfurniture]

Overview

I wish we had

return SwapErr({ ... })

instead of

return Err(makeSwapErrorRight({ ... }))

References and additional details

If SwapErr as a class extending Err isn't doable, then a function achieving the same idea is fine.

Context
#8294 (comment)

Acceptance Criteria

• makeSwapErrorRight is removed in favor of SwapErr (or equivalent) which is an extension of Err

Need By Date

No response

Screenshots/Mockups

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Estimated effort

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