Use gitaly_migrate helper on all current migrations in repository
What does this MR do?
Use gitaly_migrate helper on all current migrations in repository, as a follow up to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10773#note_28694112
Are there points in the code the reviewer needs to double check?
No
Why was this MR needed?
gitaly_migrate masks GRPC exceptions with higher level Gitlab::Git exceptions
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together