GitLab

Update frontend (GHC 8.10)

See merge request !26

fix a CI todo and some cleanup

See merge request !25

the blocking issue [Issue 273034](https://gitlab.com/gitlab-org/gitlab/-/issues/273034) is resolved and the used gitlab instance runs a version that has the fix

nightlies and tests are no longer a separate package, as originally intended, as we can now add that information as part of the version

this allows to clean up the packs-nigthly-* and pakcs-test-* packages
which would also accumulate duplicates of all files for each test/nightly run

this way `update_version.sh` and `release_helper.sh` can't easily diverge

for release links this was already done in commits 5d67c555 and 07b31c96