### 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_
response["ETagHeader"] = key.etag
        if response["StatusCode"] == 303:
            
            try:
                redirect = _create_redirect_for_post_request(
                    base_redirect=context.request.form["success_action_redirect"],
                    bucket=bucket,
                    key=key_name,
                    etag=key.etag,
                )
                response["LocationHeader"] = redirect
            except ValueError:
                
                response["StatusCode"] = 204
        response["LocationHeader"] = response.get(
            "LocationHeader", f"{get_full_default_bucket_location(bucket)}{key_name}"
        )
        if bucket in self.get_store().bucket_versioning_status:
            response["VersionId"] = key.version_id
        self._notify(context, key_name=key_name)
        if context.request.form.get("success_action_status") != "201":
            return response
        response["ETag"] = key.etag
        response["Bucket"] = bucket
        response["Key"] = key_name
        response["Location"] = response["LocationHeader"]
        return response
    @handler("GetObjectAttributes", expand=False)
    def get_object_attributes(