Fix the `1st contribution` label
According to the metrics and cases reported from the community, the 1st contribution label hasn't been properly applied since the beginning of the year.
Relevant Slack thread from the #q_engineering_productivity.
Currently the logic is defined as:
The 1st Contribution label is applied to the first MR authored by a Community contributor for every project they contribute to within gitlab-org.
We need to explore, why since the beginning of the year, the label stopped being properly applied and identify the next steps towards fixing it.
Edited by Christos Bacharakis