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_
            
from localstack.services.s3 import constants as s3_constants
from localstack.services.s3.utils import parse_expiration_header
from localstack.testing.aws.util import is_aws_cloud
from localstack.testing.snapshots.transformer_utility import TransformerUtility
from localstack.utils import testutil
from localstack.utils.aws import aws_stack
from localstack.utils.collections import is_sub_dict
from localstack.utils.files import load_file
from localstack.utils.run import run
from localstack.utils.server import http2_server
from localstack.utils.strings import (
    checksum_crc32,
    checksum_crc32c,
    hash_sha1,
    hash_sha256,
    short_uid,
    to_bytes,
    to_str,
)
from localstack.utils.sync import retry
from localstack.utils.testutil import check_expected_lambda_log_events_length
if TYPE_CHECKING:
    from mypy_boto3_s3 import S3Client
LOG = logging.getLogger(__name__)
HEADER_TRANSFORMER = [
    TransformerUtility.jsonpath("$..HTTPHeaders.date", "date", reference_replacement=False),
    TransformerUtility.jsonpath(
        "$..HTTPHeaders.last-modified", "last-modified", reference_replacement=False
    ),
    TransformerUtility.jsonpath("$..HTTPHeaders.server", "server", reference_replacement=False),