Fix `RunnersFinder#group_runners` cross-joining projects
From !62092 (closed) we have seen that RunnersFinder#group_runners
needs to join between projects
table and ci_*
tables.
Options
- Use
.pluck
to fetchids
- Change how the feature is being used, and remove this method alltogether
Edited by Kamil Trzciński (Back 2025-01-01)