### 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_
# List
        list_s_v2_url = f"{bucket_url}?list-type=2"
        resp = s3_http_client.get(list_s_v2_url, headers=headers)
        assert b'<?xml version="1.0" encoding="UTF-8"?>\n' in get_xml_content(resp.content)
        resp_dict = xmltodict.parse(resp.content)
        assert "ListBucketResult" in resp_dict
        # same 
        list_s_v2_tags = list(resp_dict["ListBucketResult"].keys())
        assert list_s_v2_tags.index("Name") < list_s_v2_tags.index("Contents")
        assert list_s_v2_tags[-1] == "Contents"
        # List
        list_multipart_uploads_url = f"{bucket_url}?uploads"
        resp = s3_http_client.get(list_multipart_uploads_url, headers=headers)
        assert b'<?xml version="1.0" encoding="UTF-8"?>\n' in get_xml_content(resp.content)
        resp_dict = xmltodict.parse(resp.content)
        assert "ListMultipartUploadsResult" in resp_dict
        # GetB
        location_constraint_url = f"{bucket_url}?location"
        resp = s3_http_client.get(location_constraint_url, headers=headers)
        assert b'<?xml version="1.0" encoding="UTF-8"?>\n' in get_xml_content(resp.content)
        tagging = {"TagSet": [{"Key": "tag1", "Value": "tag1"}]}
        # put 
        aws_client.s3.put_bucket_tagging(Bucket=s3_bucket, Tagging=tagging)
        # GetB
        get_bucket_tagging_url = f"{bucket_url}?tagging"
        resp = s3_http_client.get(get_bucket_tagging_url, headers=headers)
        resp_dict = xmltodict.parse(resp.content)
        assert resp_dict["Tagging"]["TagSet"] == {"Tag": {"Key": "tag1", "Value": "tag1"}}
        # put 
        key_name = "test-key"