Add index to external status checks for id and project_id
What does this MR do and why?
The API projects/:id/external_status_checks was breaching the default threshold of 1s and thus impacting the error budget. On investigating we realised that a better index can improve the performance of the database query.
- Existing query - https://console.postgres.ai/gitlab/gitlab-production-tunnel-pg12/sessions/21238/commands/69277
- Index creation - https://console.postgres.ai/gitlab/gitlab-production-tunnel-pg12/sessions/21238/commands/69278
- Query with index - https://console.postgres.ai/gitlab/gitlab-production-tunnel-pg12/sessions/21238/commands/69279
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Related to #421379 (closed)