Cherry-pick PR #38377 into release-3.9 (#38386)

Component commits:
4baff1b241 moveToNewFile: handle namespace imports too
Fixes #35591

Co-authored-by: Eli Barzilay <eli@barzilay.org>

src/services/refactors/moveToNewFile.ts

@@ -533,6 +533,7 @@ namespace ts.refactor {
             case SyntaxKind.ImportEqualsDeclaration:
             case SyntaxKind.ImportSpecifier:
             case SyntaxKind.ImportClause:
+            case SyntaxKind.NamespaceImport:
                 return true;
             case SyntaxKind.VariableDeclaration:
                 return isVariableDeclarationInImport(decl as VariableDeclaration);