### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

- Localstack fails with HTTP 500, error code "InternalError", message "not enough values to unpack (expected 2, got 1)" when `CopySource` is an invalid string for `copy_object` API.

### Expected Behavior

- For the same API `copy_object`, the cloud fails with HTTP 400, error code "InvalidArgument".
- Localstack should handle invalid `CopySource` i.e., it is a dictionary with one value or an invalid string not adhering to "{bucket}/{key}" format.

### How are you starting LocalStack?

With a `docker run` command

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

    docker run localstack/localstack

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

    botoclient.copy_object(CopySource="Invalid_random_string", Bucket="test_bucket", Key=key) 


 test_bucket is a valid bucket.  

### Environment

```markdown
- OS: Ubuntu 22.04.2 LTS
- LocalStack: 2.1.0
- boto3: 1.28.6
```


### Anything else?

_No response_
# writ
        resp = aws_client.s3.put_bucket_logging(
            Bucket=bucket_name, BucketLoggingStatus=bucket_logging_status
        )
        snapshot.match("put-bucket-logging", resp)
        resp = aws_client.s3.get_bucket_logging(Bucket=bucket_name)
        snapshot.match("get-bucket-logging", resp)
        # dele
        resp = aws_client.s3.put_bucket_logging(Bucket=bucket_name, BucketLoggingStatus={})
        snapshot.match("put-bucket-logging-delete", resp)
    @markers.aws.validated
    def test_put_bucket_logging_accept_wrong_grants(self, aws_client, s3_create_bucket, snapshot):
        snapshot.add_transformer(snapshot.transform.key_value("TargetBucket"))
        bucket_name = s3_create_bucket()
        target_bucket = s3_create_bucket()
        # We n
        # TODO
        aws_client.s3.delete_bucket_ownership_controls(Bucket=target_bucket)
        bucket_logging_status = {
            "LoggingEnabled": {
                "TargetBucket": target_bucket,
                "TargetPrefix": "log",
                "TargetGrants": [
                    {
                        "Grantee": {
                            "URI": "http://acs.amazonaws.com/groups/s3/LogDelivery",
                            "Type": "Group",
                        },
                        "Permission": "WRITE",
                    },