fix(core): do not add an ending new line when serializing a json (#23440)

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## Current Behavior
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Fixes #19315

packages/nx/src/generators/utils/json.ts

@@ -38,7 +38,8 @@ export function writeJson<T extends object = object>(
   value: T,
   options?: JsonSerializeOptions
 ): void {
-  tree.write(path, serializeJson(value, options));
+  const serialized = serializeJson(value, options);
+  tree.write(path, `${serialized}\n`);
 }
 
 /**

packages/nx/src/utils/json.ts

@@ -96,5 +96,5 @@ export function serializeJson<T extends object = object>(
   input: T,
   options?: JsonSerializeOptions
 ): string {
-  return JSON.stringify(input, null, options?.spaces ?? 2) + '\n';
+  return JSON.stringify(input, null, options?.spaces ?? 2);
 }