Label incidents triggered by failed tests with test-level:*. For test-level:e2e, announce in qa-master channel
See https://gitlab.com/gitlab-org/quality/engineering-productivity/master-broken-incidents/-/issues/6550#note_1919854497
### Updated proposal:
1. Label incidents with `test-level:*` labels based on the jobs names:
- job name starts with `rspec(-ee)? unit` -> `test-level:unit`
- job name starts with `rspec(-ee)? integration` -> `test-level:integration`
- job name starts with `rspec(-ee)? system` -> `test-level:system`
- job name starts with `rspec(-ee)? (background_)?migration` -> `test-level:migration`
- job name includes `e2e` -> `test-level:e2e`
2. For `test-level:e2e`, announce of qa-master channel
issue