### 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_
return (
                "a;chunk-signature=b5311ac60a88890e740a41e74f3d3b03179fd058b1e24bb3ab224042377c4ec9\r\n"
                f"{content}\r\n"
                "0;chunk-signature=78fae1c533e34dbaf2b83ad64ff02e4b64b7bc681ea76b6acf84acf1c48a83cb\r\n"
                f"x-amz-checksum-sha256:{checksum_value}\r\n"
                "x-amz-trailer-signature:712fb67227583c88ac32f468fc30a249cf9ceeb0d0e947ea5e5209a10b99181c\r\n\r\n"
            )
        # put 
        url = f"{config.service_url('s3')}/{s3_bucket}/{_key}"
        valid_data = get_data(body, valid_checksum)
        .put(url, valid_data, headers=headers, verify=False)
        # get 
        downloaded_ = aws_client.s3.get_(Bucket=s3_bucket, Key=_key)
        download_file_ = to_str(downloaded_["Body"].read())
        assert len(body) == len(str(download_file_))
        assert body == str(download_file_)
        # test 
        wrong_data = get_data(body, "wrongchecksum")
        request = .put(url, wrong_data, headers=headers, verify=False)
        assert request.status_code == 400
        assert "Value for x-amz-checksum-sha256 header is invalid." in request.text
    @pytest.mark.only_localstack
    def test_virtual_host_proxy_does_not_decode_gzip(self, aws_client, s3_bucket):