Remove duplicates from supportedTSExtensionsForExtractExtension (#53891)

Author: Andarist

src/compiler/utilities.ts

@@ -9100,7 +9100,7 @@ export const supportedTSExtensions: readonly Extension[][] = [[Extension.Ts, Ext
 export const supportedTSExtensionsFlat: readonly Extension[] = flatten(supportedTSExtensions);
 const supportedTSExtensionsWithJson: readonly Extension[][] = [...supportedTSExtensions, [Extension.Json]];
 /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
-const supportedTSExtensionsForExtractExtension: readonly Extension[] = [Extension.Dts, Extension.Dcts, Extension.Dmts, Extension.Cts, Extension.Mts, Extension.Ts, Extension.Tsx, Extension.Cts, Extension.Mts];
+const supportedTSExtensionsForExtractExtension: readonly Extension[] = [Extension.Dts, Extension.Dcts, Extension.Dmts, Extension.Cts, Extension.Mts, Extension.Ts, Extension.Tsx];
 /** @internal */
 export const supportedJSExtensions: readonly Extension[][] = [[Extension.Js, Extension.Jsx], [Extension.Mjs], [Extension.Cjs]];
 /** @internal */