feat: Add custom keys to our log entries
Our logging tooling expects
every log entry to have a type
and stage
field. We normally add these via
fluentd rules,
but we are not using fluentd for the Code Suggestions deployment (see https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/23729#note_1402517982).
As an alternative, let's add the labels here at the source.
Closes https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/23729