Change test coverage log to debug level (#20648)

* Update TestCoverage.cs

* Removed unnecessary debug info

Co-authored-by: Vincent Dai <23257217+vidai-msft@users.noreply.github.com>

src/Accounts/Authentication/TestCoverage.cs

@@ -1,4 +1,4 @@
-// ----------------------------------------------------------------------------------
+// ----------------------------------------------------------------------------------
 //
 // Copyright Microsoft Corporation
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -69,8 +69,6 @@ static TestCoverage()
             {
                 Directory.CreateDirectory(s_testCoveragePath);
             }
-
-            Console.WriteLine($"Test coverage data location: ${s_testCoveragePath}");
         }
 
         private string GenerateCsvHeader()