Common AST formats such as TS and Babel do not use a separate node for comments, but instead attach comments to other AST nodes. Previously this was worked around in TS by creating a `NotEmittedStatement` AST node to attach the comment to. But Babel does not have this facility, so it will not be a viable approach for the linker. This commit refactors the output AST, to remove the `CommentStmt` and `JSDocCommentStmt` nodes. Instead statements have a collection of `leadingComments` that are rendered/attached to the final AST nodes when being translated or printed. PR Close #38811
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