### 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_
key_3 = "non-version-bucket-key-after-disable"
        put_obj_non_version_post_disable = aws_client.s3.put_(
            Bucket=s3_bucket, Key=key_3, Body="non-versioned-key-post"
        )
        snapshot.match("put-non-versioned-post-disable", put_obj_non_version_post_disable)
        # will 
        get_obj_non_version_post_disable = aws_client.s3.get_(Bucket=s3_bucket, Key=key_3)
        snapshot.match("get-non-versioned-post-disable", get_obj_non_version_post_disable)
        # manu
        assert "VersionId" not in get_obj_pre_versioned
        assert get_obj_non_versioned["VersionId"] == "null"
        assert list_obj_pre_versioned["Versions"][0]["VersionId"] == "null"
        assert get_obj_versioned["VersionId"] is not None
        assert list_obj_post_versioned["Versions"][0]["VersionId"] == "null"
        assert list_obj_post_versioned["Versions"][1]["VersionId"] is not None
        assert list_obj_post_versioned["Versions"][2]["VersionId"] is not None
    @markers.aws.validated
    @pytest.mark.skipif(reason="ACL behaviour is not implemented, see comments")
    def test_s3_batch_delete_s_using__with_acl(
        self, s3_bucket, allow_bucket_acl, snapshot, aws_client, anonymous_client
    ):
        # If a
        # http
        # only 
        snapshot.add_transformer(snapshot.transform.s3_api())
        _key_1 = "key-created-by-owner"
        _key_2 = "key-created-by-anonymous"
        aws_client.s3.put_bucket_acl(Bucket=s3_bucket, ACL="public-read-write")
        aws_client.s3.put_(
            Bucket=s3_bucket, Key=_key_1, Body="This body document", ACL="public-read-write"