### 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_
def __init__(self, message=None):
        if not message:
            message = "The XML you provided was not well-formed or did not validate against our published schema"
        super().__init__("MalformedXML", status_code=400, message=message)
class MalformedACLError(CommonServiceException):
    def __init__(self, message=None):
        super().__init__("MalformedACLError", status_code=400, message=message)
class InvalidRequest(CommonServiceException):
    def __init__(self, message=None):
        super().__init__("InvalidRequest", status_code=400, message=message)
class UnexpectedContent(CommonServiceException):
    def __init__(self, message=None):
        super().__init__("UnexpectedContent", status_code=400, message=message)
class NoSuchConfiguration(CommonServiceException):
    def __init__(self, message=None):
        super().__init__("NoSuchConfiguration", status_code=404, message=message)
def get_full_default_bucket_location(bucket_name):
    if config.HOSTNAME_EXTERNAL != config.LOCALHOST:
        host_definition = localstack_host(
            use_hostname_external=True, custom_port=config.get_edge_port_http()
        )
        return f"{config.get_protocol()}://{host_definition.host_and_port()}/{bucket_name}/"
    else:
        host_definition = localstack_host(use_localhost_cloud=True)
        return f"{config.get_protocol()}://{bucket_name}.s3.{host_definition.host_and_port()}/"
class S3Provider(S3Api, ServiceLifecycleHook):
    @staticmethod
    def get_store(context: Optional[RequestContext] = None) -> S3Store: