### 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_
# mimi
        # http
        policy = {
            "Id": "test-s3-bucket-access",
            "Version": "2012-10-17",
            "Statement": [
                {
                    "Sid": "AllowSSLRequestsOnly",
                    "Action": "s3:*",
                    "Effect": "Deny",
                    "Resource": [f"arn:aws:s3:::{s3_bucket}", f"arn:aws:s3:::{s3_bucket}/*"],
                    "Condition": {"Bool": {"aws:SecureTransport": "false"}},
                    "Principal": "*",
                }
            ],
        }
        aws_client.s3.put_bucket_policy(Bucket=s3_bucket, Policy=json.dumps(policy))
        # put 
        content = b"test-content"
        aws_client.s3.put_(Bucket=s3_bucket, Key="test/123", Body=content)
        result = aws_client.s3.get_(Bucket=s3_bucket, Key="test/123")
        received_content = result["Body"].read()
        assert received_content == content
        # enab
        monkeypatch.setattr(s3_constants, "ENABLE_MOTO_BUCKET_POLICY_ENFORCEMENT", True)
        with pytest.raises(ClientError) as exc:
            aws_client.s3.get_(Bucket=s3_bucket, Key="test/123")
        assert exc.value.response["Error"]["Code"] == "403"
        assert exc.value.response["Error"]["Message"] == "Forbidden"
def _anon_client(service: str):