Prepare 15.7.8 release for cng-jh
Release issue: https://jihulab.com/gitlab-cn/release/tasks/-/issues/46
Summary
This MR prepares 15-7-stable-jh
for 15.7.8
.
Automated cherry-picking
Merge requests labeled ~"Pick into 15.7" should be automatically picked into this MR.
Manual intervention
If merge requests cannot be picked automatically they have to be created
manually targeting 15-7-stable-jh-patch-8
.
See also Patch Releases documentation.