### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

CopyObject API does not check precondition headers such as `x-amz-copy-source-if-modified-since`. Instead it seems to always copy the object.

### Expected Behavior

The API should return a 412 response with content similar to:

```
<Error><Code>PreconditionFailed</Code><Message>At least one of the pre-conditions you specified did not hold</Message><Condition>x-amz-copy-source-If-Modified-Since</Condition><RequestId>14HR9PXJRG5B1GR5</RequestId><HostId>HztBs2jYea1fzzPWo1JWy33NQJqo1S1IsK62rkbnVEI04PnGNCi8sPVrichGQxH3FQwLA2RIyF4=</HostId></Error>
```

### How are you starting LocalStack?

With a docker-compose file

### 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)

```
aws s3  --profile localstack --endpoint-url http://s3.localhost.localstack.cloud:4566 \
  ls s3://net-amazon-s3-test/Makefile.am
2023-01-25 10:47:40        537 Makefile.am

aws s3api copy-object --copy-source net-amazon-s3-test/Makefile.am --key Makefile.am.2 \
  --bucket net-amazon-s3-test2 --profile localstack --endpoint-url http://s3.localhost.localstack.cloud:4566 \
  --copy-source-if-modified-since "Wed, 25 Jan 2023 16:16:27 GMT"
{
    "CopyObjectResult": {
        "ETag": "\"46ada9d1fe8f8a311ff4504c226e061c\"",
        "LastModified": "2023-01-25T16:18:43+00:00"
    }
}
```

### Environment

```markdown
- OS: penguin
- LocalStack: latest
```


### Anything else?

_No response_
<Key>{_key_1}</Key>
          </Object>
          <Object>
            <Key>{_key_2}</Key>
          </Object>
        </Delete>
        """
        md = hashlib.md5(data.encode("utf-8")).digest()
        contents_md5 = base64.b64encode(md).decode("utf-8")
        header = {"content-md5": contents_md5, "x-amz-request-payer": "requester"}
        r = .post(url=url, data=data, headers=header)
        assert 200 == r.status_code
        response = xmltodict.parse(r.content)
        response["DeleteResult"].pop("@xmlns", None)
        assert response["DeleteResult"]["Error"]["Key"] == _key_1
        assert response["DeleteResult"]["Error"]["Code"] == "AccessDenied"
        assert response["DeleteResult"]["Deleted"]["Key"] == _key_2
        snapshot.match("multi-delete-with-", response)
        response = aws_client.s3.list_s(Bucket=bucket_name)
        assert 200 == response["ResponseMetadata"]["HTTPStatusCode"]
        assert len(response["Contents"]) == 1
        snapshot.match("list-remaining-s", response)
    @pytest.mark.aws_validated
    @pytest.mark.skip_snapshot_verify(
        paths=[
            "$..DeleteResult.Deleted..VersionId",
            "$..Prefix",
        ]
    )
    def test_s3_batch_delete_public_s_using_(