Prepare 10.8 RC2 release

Main release issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/45897

Summary

This MR prepares 10-8-stable for %10.8 (RC2) by merging 10-8-stable-prepare-rc2 into 10-8-stable.

Note to leave in MRs

Picked into https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18744, will merge into `10-8-stable` ready for `10.8 RC2`

/unlabel ~"Pick into 10.8"

Steps

1. Cherry-pick the fix for https://gitlab.com/gitlab-org/gitlab-ce/issues/46049
2. Merge CE-to-EE using one of the workflows described in the Merge CE stable changes to EE docs

• Note: Often, after a release has been tagged, the VERSION file in ee will have a conflict. Accept the -ee one

1. Once this MR is green merge it to stable, preferably with a manual fast-forward merge to minimize waiting time, as described in Merging preparation MRs into stable

Checklist

• Fix for #46049 (closed) has been picked
• Conflicts resolved
• No new commits have introduced directly to the stable branch while this MR was in progress. If there are, ensure these are merged into EE and check for a green pipeline after merging this MR.