Port of "2274-store-last-repository-updated-at" to CE

Port of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1788 to CE

assigned to @dbalexandre

added 77 commits

• cabdbaca...7a66cd68 - 72 commits from branch master
• cdcbe99a - Add last_repository_updated_at to projects
• 341964da - Add index to last_repository_updated_at on projects
• 56db54d3 - Set last_repository_updated_at to created_at upon project creation
• 91b5aaf7 - Update last_repository_updated_at when a push event is created
• 76766c6c - Update last_repository_updated_at when the wiki is updated

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added 1 commit

• 9f2edaa8 - Update last_repository_updated_at when the wiki is updated

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assigned to @rspeicher

assigned to @dbalexandre

added 1 commit

• 6911baa1 - Fix Import/Export configuration spec

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assigned to @rspeicher

approved this merge request

enabled an automatic merge when the pipeline for 6911baa1 succeeds

merged

mentioned in commit 79dc8171