Delete Labels & IssueLabels on Repo Delete too (#15039)
* Doctor: find IssueLabels without existing label
* on Repo Delete: delete labels & issue_labels too
* performance nits
* Add Migration: Delete orphaned IssueLabels
* Migration v174: use Sync2
* USE sess !!!
* better func name
* code format & comment
* RAW SQL
* Update models/migrations/v176.go
* next try?
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