BucketExistsAsync does not handle exception properly

[nwrox]

When testing a client configured with a fake endpoint, the method BucketExistsAsync still returns true, because there's not a check for other status codes or the exception isn't thrown here:

minio-dotnet/Minio/ApiEndpoints/BucketOperations.cs

Lines 84 to 90 in 9846edb

	catch (InternalClientException ice)
	{
	if ((ice.ServerResponse is not null &&
	HttpStatusCode.NotFound.Equals(ice.ServerResponse.StatusCode)) ||
	ice.ServerResponse is null)
	return false;
	}

Is this correct?

[ebozduman]

@nwrox

I've tested and verified the fix, but please reopen if you find that the fix is not good in your env.