[FileConnector][Move]No error message is provided when an already existing file is going to be replaced by the same file name

[isuruuy429]

Description:
$subject.

Related issues
#1458

Steps to reproduce

1. Create the API mentioned in the above issue.
2. Invoke the API with the following payload. Make sure in the destination folder, which the file is going to be copied, has the exact same file. As an example if you are going to copy abc.txt file, the destination folder should also have that file.

{
	"source":"/Users/IsuruUyanage/Music/integration-tests/abc.txt",
	"destination":"/Users/IsuruUyanage/Music/iTunes"
}

Expected: It should provide an error message that file is already existing.
Actual: It does not provide any error message,