Sort timeline events by occurred_at and then by id

What does this MR do and why?

Sort timeline events by occurred_at and then by id. Fixes the broken sorting: two events occurred at the same time were sorted incorrectly.

Related to #372193 (closed)

SQL query

Issue used in queries https://gitlab.com/gitlab-examples/ops/incident-setup/everyone/tanuki-inc/-/issues/incident/2551

Before

SELECT "incident_management_timeline_events".*
FROM "incident_management_timeline_events"
WHERE "incident_management_timeline_events"."issue_id" = 110490844
ORDER BY "incident_management_timeline_events"."occurred_at" ASC

Explain

https://explain.depesz.com/s/J9vO

After

SELECT "incident_management_timeline_events".*
FROM "incident_management_timeline_events"
WHERE "incident_management_timeline_events"."issue_id" = 110490844
ORDER BY "incident_management_timeline_events"."occurred_at" ASC, "incident_management_timeline_events"."id" ASC

Explain

https://explain.depesz.com/s/Witc

MR acceptance checklist

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