### 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_
aws_client,
    ):
        # test 
        _key = "temp.txt"
        client = _s3_client_custom_config(
            Config(signature_version="s3v4"),
        )
        url = client.generate_presigned_url(
            "put_",
            Params={"Bucket": s3_bucket, "Key": _key, "StorageClass": StorageClass.STANDARD},
        )
        assert StorageClass.STANDARD not in url
        handler_file = os.path.join(
            os.path.dirname(__file__), "../awslambda/functions/lambda_s3_integration_presign.js"
        )
        temp_folder = create_tmp_folder_lambda(
            handler_file,
            run_command="npm i @aws-sdk/util-endpoints @aws-sdk/client-s3 @aws-sdk/s3-request-presigner @aws-sdk/middleware-endpoint",
        )
        function_name = f"func-integration-{short_uid()}"
        create_lambda_function(
            func_name=function_name,
            zip_file=testutil.create_zip_file(temp_folder, get_content=True),
            runtime=LAMBDA_RUNTIME_NODEJS14X,
            handler="lambda_s3_integration_presign.handler",
            role=lambda_su_role,
        )
        s3_create_bucket(Bucket=function_name)
        response = aws_client.awslambda.invoke(FunctionName=function_name)
        presigned_url = response["Payload"].read()