### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

copyObject and putObject (and perhaps other requests) requests are accepted and do not return an error when an SSE KMS key is specified. 

### Expected Behavior

The error which should be returned is KMS.NotFoundException.

### How are you starting LocalStack?

Custom (please describe below)

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

    Localstack testcontainers 

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

   Call copyObject/putObject via latest version using AWS SDK V2 and specific a ssekmsKeyId.

```java
final var copyObjectRequestBuilder =
        CopyObjectRequest.builder()
            .serverSideEncryption(ServerSideEncryption.AWS_KMS)
            .ssekmsKeyId("NON-EXISTENT KMS KEY")
            .sourceBucket(sourceBucketName)
            .sourceKey(sourceKey)
            .destinationBucket(destinationBucket)
            .destinationKey(destinationKey);
final var copyObjectResponse = sourceRegionS3Client.copyObject(copyObjectRequest); // Error should be thrown here but localstack does not return an error
```

### Environment

```markdown
- OS: MacOS 13.0
- LocalStack: Latest (v1.2.0)
```


### Anything else?

_No response_
def __init__(self, message=None):
        super().__init__("UnexpectedContent", status_code=400, message=message)
def get_full_default_bucket_location(bucket_name):
    if config.HOSTNAME_EXTERNAL != config.LOCALHOST:
        return f"{config.get_protocol()}://{config.HOSTNAME_EXTERNAL}:{config.get_edge_port_http()}/{bucket_name}/"
    return f"{config.get_protocol()}://{bucket_name}.s3.{LOCALHOST_HOSTNAME}:{config.get_edge_port_http()}/"
class S3Provider(S3Api, ServiceLifecycleHook):
    @staticmethod
    def get_store() -> S3Store:
        return s3_stores[get_aws_account_id()][aws_stack.get_region()]
    def _clear_bucket_from_store(self, bucket: BucketName):
        store = self.get_store()
        store.bucket_lifecycle_configuration.pop(bucket, None)
        store.bucket_versioning_status.pop(bucket, None)
        store.bucket_cors.pop(bucket, None)
        store.bucket_notification_configs.pop(bucket, None)
        store.bucket_replication.pop(bucket, None)
        store.bucket_website_configuration.pop(bucket, None)
    def on_after_init(self):
        apply_moto_patches()
        preprocess_request.append(self._cors_handler)
        register_website_hosting_routes(router=ROUTER)
        register_custom_handlers()
        
    def __init__(self) -> None:
        super().__init__()
        self._notification_dispatcher = NotificationDispatcher()
        self._cors_handler = S3CorsHandler()
    def on_before_stop(self):