internal: Migrate if let
replacement assists to SyntaxEditor
#18855
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Part of #15710 and #18285
This PR migrates the
replace_let_with_if_let
,replace_if_let_with_match
, andreplace_match_with_if_let
assists. It also cleans up a few of the oldmake::
constructors which should make future migrations easier, and also subtly hint at the kind of API we'd want from the newSyntaxFactory
constructors.