chore: refine CoreOperationsBenchmark description formatting in Program.cs

- Removed unnecessary space before the estimated execution time in the benchmark description for CoreOperationsBenchmark to enhance clarity.

Author: leonibr

Benchmarks/Program.cs

@@ -38,7 +38,7 @@
 Console.WriteLine("========================================");
 Console.WriteLine();
 Console.WriteLine("Available benchmark classes:");
-Console.WriteLine("1. CoreOperationsBenchmark - Basic cache operations (Get, Set, Delete, Refresh) [~10 minutes]");
+Console.WriteLine("1. CoreOperationsBenchmark - Basic cache operations (Get, Set, Delete, Refresh)[~10 minutes]");
 Console.WriteLine("2. DataSizeBenchmark - Performance with different payload sizes [~10 minutes]");
 Console.WriteLine("3. ExpirationBenchmark - Different expiration strategies [~10 minutes]");
 Console.WriteLine("4. ConcurrencyBenchmark - Concurrent access patterns [~15 minutes]");