Specify the git author name, email and date for package repos.
Created by: olafurpg
Fixes #24541 (closed). Previously, package repos used author names [email protected]
.
This could cause problem where the gitserver hostname would change in
the future and the git commit SHAs would update and LSIF uploads would
invalidate. Now, we always use a stable git author name, email and date
to ensure that the git commit SHA remains stable.