Automatically or Manually remove Running builds from Pull Requests if build is missed

If build hung up, or network error, Stash will always contains builds in Pull Request in Running state. No way to remove them from it.

This disables Pull Request merging if you enables "Requires for 1 success build" in settings.

Stash must have ping Builds, if no pings from CI for Running state build since last hour, then build may be ignored or removed.