Missing values in PipelineStatus enum

[lesiak]

Gitlab docs for pipelines states that the following values are supported for pipeline status:
created, waiting_for_resource, preparing, pending, running, success, failed, canceled, skipped, manual, scheduled

Currently supported values in PipelineStatus enum
RUNNING, PENDING, SUCCESS, FAILED, CANCELED, SKIPPED, MANUAL;

This means we need following states to be added:
created, waiting_for_resource, preparing, scheduled