getopts: format failure messages with Show
#14884
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This obsoletes the old `to_err_msg` method. Replace
println!("Error: {}", failure.to_err_msg())
let string = failure.to_err_msg();
with
println!("Error: {}", failure)
let string = failure.to_str();
[breaking-change]
bors
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flip1995
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May 31, 2025
`ui_test` detects old style headers so it's redundant changelog: none
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