if-else should format to either single line or multiline

Describe the bug

formatting an if-else statement where all blocks are considered "one-liners" formats the whole statement as a single line. (great!)

however if one of the blocks is considered a one-liner but others are not, it should abandon the strategy of keeping as single line. that's how other formatters deal with this.

this also applies to try-catch-finally. maybe other things as well.

Script or statement

if true { foo } else { bar | baz | qux }

Actual behavior/output

formats to

if true { foo } else {
     bar | baz | qux
}

Expected behavior/output

if true {
     foo
} else {
     bar | baz | qux
}

Environment

current github versions of nushell and nufmt

Reproduce the issue with the provided if true { foo } else { bar | baz | qux } statement using the current nufmt. Trace the formatter’s handling of mixed one-line and multiline blocks, then add a regression test covering if-else and, if applicable, try-catch-finally; done means mixed blocks consistently use multiline formatting.