needed to fix issue as described in #10280
* rename check-db to check-db-version
* add check-db-consistency:
* find issues without existing repository
* find pulls without existing issues
* find tracked times without existing issues/pulls
* find labels without repository or org reference
Co-authored-by: guillep2k <[email protected]>
Co-authored-by: Lunny Xiao <[email protected]>