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_
            
snapshot.match("get-bucket-lifecycle-conf", result)
        key_match_1 = "test-expiry"
        tag_set_match = "testlifecycle=positive&testlifecycletwo=positivetwo"
        put_ = aws_client.s3.put_(
            Body=b"test", Bucket=s3_bucket, Key=key_match_1, Tagging=tag_set_match
        )
        snapshot.match("put--match-both-rules", put_)
        _, parsed_exp_rule = parse_expiration_header(put_["Expiration"])
        assert parsed_exp_rule == rule_id_1
        key_match_2 = "test-one-rule"
        tag_set_match_one = "testlifecycle=positive"
        put__2 = aws_client.s3.put_(
            Body=b"test", Bucket=s3_bucket, Key=key_match_2, Tagging=tag_set_match_one
        )
        snapshot.match("put--match-rule-1", put__2)
        _, parsed_exp_rule = parse_expiration_header(put__2["Expiration"])
        assert parsed_exp_rule == rule_id_1
        key_no_match = "no-rules"
        tag_set_no_match = "testlifecycle2=positivetwo"
        put__3 = aws_client.s3.put_(
            Body=b"test", Bucket=s3_bucket, Key=key_no_match, Tagging=tag_set_no_match
        )
        snapshot.match("put--no-match", put__3)
        assert "Expiration" not in put__3
def _anon_client(service: str):
    conf = Config(signature_version=UNSIGNED)
    if os.environ.get("TEST_TARGET") == "AWS_CLOUD":
        return boto3.client(service, config=conf, region_name=None)
    return aws_stack.create_external_boto_client(service, config=conf)
def _s3_client_custom_config(conf: Config, endpoint_url: str = None):