As reported in https://github.com/localstack/localstack/issues/6659#issuecomment-1630932643_, `HeadObject` does not respect `ChecksumMode`. 


```shell
at 09:31:57 ➜ AWS_DEFAULT_REGION=us-west-1 aws --endpoint-url=http://localhost:4566 s3api create-bucket --bucket test-bucket --create-bucket-configuration LocationConstraint=us-west-1
{
    "Location": "http://test-bucket.s3.localhost.localstack.cloud:4566/"
}

at 09:32:13 ➜ aws --endpoint-url=http://localhost:4566 s3api put-object --bucket test-bucket --key file.json --body README.md --checksum-algorithm SHA256
{
    "ETag": "\"4bb2f1387449d690bff6336ea255909c\"",
    "ChecksumSHA256": "bzOikXXMUqRTCrpVq7Pt7LjJ0fjR3ccUfM19S/gnfqA="
}

# SHA256 missing here
at 09:32:20 ➜ aws --endpoint-url=http://localhost:4566 s3api head-object --bucket test-bucket --key file.json --checksum-mode Enabled
{
    "AcceptRanges": "bytes",
    "LastModified": "2023-07-11T13:32:15+00:00",
    "ContentLength": 1455,
    "ETag": "\"4bb2f1387449d690bff6336ea255909c\"",
    "ContentType": "binary/octet-stream",
    "Metadata": {}
}
```

Note the equivalent response from S3 actual includes the SHA256 value

```shell
at 10:21:23 ➜ aws s3api head-object --bucket test-bucket --key file.json --checksum-mode Enabled
{
    "AcceptRanges": "bytes",
    "Expiration": "expiry-date=\"Thu, 13 Jul 2023 00:00:00 GMT\", rule-id=\"all\"",
    "LastModified": "2023-07-11T14:21:09+00:00",
    "ContentLength": 1956,
    "ChecksumSHA256": "bj7fqCqtaF95M1ULwQRDJuHbL/Xd9NVMH6pua9OINcc=",
    "ETag": "\"f4be535d45019a4408dd5369986919f8\"",
    "ContentEncoding": "",
    "ContentType": "binary/octet-stream",
   
    "Metadata": {},
    
}
```

_Originally posted by @bdurrani in https://github.com/localstack/localstack/issues/6659#issuecomment-1630932643_
            
aws_client.s3.put_(Bucket=s3_bucket, Key=key_name, Tagging="tag1=tag1")
        # GetO
        get__tagging_url = f"{bucket_url}/{key_name}?tagging"
        resp = s3_http_client.get(get__tagging_url, headers=headers)
        resp_dict = xmltodict.parse(resp.content)
        assert resp_dict["Tagging"]["TagSet"] == {"Tag": {"Key": "tag1", "Value": "tag1"}}
    @pytest.mark.aws_validated
    def test_s3_delete_s_trailing_slash(self, aws_http_client_factory, s3_bucket, aws_client):
        _key = "key-to-delete-trailing-slash"
        # crea
        aws_client.s3.put_(Bucket=s3_bucket, Key=_key, Body=b"123")
        headers = {"x-amz-content-sha256": "UNSIGNED-PAYLOAD"}
        s3_http_client = aws_http_client_factory("s3", signer_factory=SigV4Auth)
        # Endp
        bucket_url = f"{_bucket_url(s3_bucket)}/?delete&x-id=DeleteObjects"
        delete_body = f"""<Delete>
            <Object>
                <Key>{_key}</Key>
             </Object>
        </Delete>
        """
        # Post 
        resp = s3_http_client.post(bucket_url, headers=headers, data=delete_body)
        assert resp.status_code == 200
        resp_dict = xmltodict.parse(resp.content)
        assert "DeleteResult" in resp_dict
        assert resp_dict["DeleteResult"]["Deleted"]["Key"] == _key
    @pytest.mark.aws_validated
    @pytest.mark.xfail(reason="Behaviour not implemented yet")
    def test_complete_multipart_parts_checksum(self, s3_bucket, snapshot, aws_client):