### 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_
code, headers, body = fn(*args, **kwargs)
        storage_class = headers.get("x-amz-storage-class")
        if storage_class == "DEEP_ARCHIVE" and not headers.get("x-amz-restore"):
            raise InvalidObjectState(storage_class=storage_class)
        return code, headers, body
    @patch(moto_s3_responses.S3Response._key_response_post)
    def _fix_key_response_post(fn, self, request, body, bucket_name, *args, **kwargs):
        code, headers, body = fn(self, request, body, bucket_name, *args, **kwargs)
        bucket = self.backend.get_bucket(bucket_name)
        if not bucket.is_versioned:
            headers.pop("x-amz-version-id", None)
        return code, headers, body
    @patch(moto_s3_responses.S3Response.all_buckets)
    def _fix_owner_id_list_bucket(fn, *args, **kwargs) -> str:
        """
        Moto does not use the same CanonicalUser ID for the owner between ListBuckets and all ACLs related response
        Patch ListBuckets to return the same ID as the ACL
        """
        res: str = fn(*args, **kwargs)
        res = res.replace(
            "<ID>bcaf1ffd86f41161ca5fb16fd081034f</ID>", f"<ID>{MOTO_CANONICAL_USER_ID}</ID>"
        )
        return res
    @patch(moto_s3_responses.S3Response._tagging_from_xml)
    def _fix_tagging_from_xml(fn, *args, **kwargs) -> Dict[str, str]: