Backport 16.9: Support multiple tags on a commit and Change tag sort order to desc

Backport of:

• Support multiple tags on a commit

We actually want to sort in descending order. The default is ascending. The original fix from !1375 (merged) only worked because one of the commit was a release candidate with a suffix, like this: v16.10.0 and v16.10.0-rc1 which in ascending order does order v16.10.0 first.

See git-tag manpage

Test evidence

~/work/gitlab/gitlab-agent 16-9-stable*
❯ git tag --points-at HEAD 2>/dev/null
v16.9.3
v16.9.6

~/work/gitlab/gitlab-agent 16-9-stable*
❯ git tag --points-at HEAD 2>/dev/null | head -n 1
v16.9.3

~/work/gitlab/gitlab-agent 16-9-stable*
❯ git tag --points-at HEAD --list 'v*' --sort '-v:refname' 2>/dev/null
v16.9.6
v16.9.3

~/work/gitlab/gitlab-agent 16-9-stable*
❯ git tag --points-at HEAD --list 'v*' --sort '-v:refname' 2>/dev/null | head -n 1
v16.9.6

Limitations

The limitation here is that it would again sort wrong for suffix releases - however, this is just for this 16.9 branch for which we won't do any suffix releases.