### 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.s3.put_bucket_logging(
                Bucket=bucket_name, BucketLoggingStatus=bucket_logging_status
            )
        snapshot.match("put-bucket-logging-non-existent-bucket", e.value.response)
        assert e.value.response["Error"]["TargetBucket"] == nonexistent_target_bucket
class TestS3MultiAccounts:
    @pytest.fixture
    def primary_client(self, aws_client):
        return aws_client.s3
    @pytest.fixture
    def secondary_client(self, aws_client_factory):
        """
        Create a boto client with secondary test credentials and region.
        """
        return aws_client_factory.get_client(
            "s3",
            aws_access_key_id=SECONDARY_TEST_AWS_ACCESS_KEY_ID,
            aws_secret_access_key=SECONDARY_TEST_AWS_SECRET_ACCESS_KEY,
            region_name=SECONDARY_TEST_AWS_REGION_NAME,
        )
    def test_shared_bucket_namespace(self, primary_client, secondary_client):
        # Ensu
        primary_client.create_bucket(Bucket="foo")
        with pytest.raises(ClientError) as exc:
            secondary_client.create_bucket(
                Bucket="foo",
                CreateBucketConfiguration={"LocationConstraint": SECONDARY_TEST_AWS_REGION_NAME},
            )
        exc.match("BucketAlreadyExists")
    def test_cross_account_access(self, primary_client, secondary_client):