untagResource method
Removes tags from an AWS resource.
May throw ValidationException. May throw ResourceNotFoundException. May throw InvalidArnException. May throw InvalidTagsException. May throw ConcurrentModificationException.
Parameter resourceArn :
The Amazon Resource Name (ARN) of the resource to remove tags from.
Parameter tagKeys :
The list of keys for the tags to be removed from the resource.
Implementation
Future<void> untagResource({
  required String resourceArn,
  required List<String> tagKeys,
}) async {
  ArgumentError.checkNotNull(resourceArn, 'resourceArn');
  ArgumentError.checkNotNull(tagKeys, 'tagKeys');
  final headers = <String, String>{
    'Content-Type': 'application/x-amz-json-1.1',
    'X-Amz-Target': 'CodePipeline_20150709.UntagResource'
  };
  await _protocol.send(
    method: 'POST',
    requestUri: '/',
    exceptionFnMap: _exceptionFns,
    // TODO queryParams
    headers: headers,
    payload: {
      'resourceArn': resourceArn,
      'tagKeys': tagKeys,
    },
  );
}