[SYNTH-13898] Inform when selective re-run is rate-limited

[Drarig29]

What and why?

When the internal query that the selective re-run feature does is rate-limited, the endpoint still returns a 200, and re-runs all tests (ignoring the selective re-run).

In that case, the backend now returns a selective_rerun_rate_limited property. This PR adds a log to inform when that happens.

Demo with a rate-limit on staging:

How?

• Update the interface and add a log.

Review checklist

• [x] Feature or bugfix MUST have appropriate tests (unit, integration)

[datadog-datadog-prod-us1[bot]]

Datadog Report

Branch report: corentin.girard/SYNTH-13898/inform-rate-limit-selective-rerun Commit report: 78d6625 Test service: datadog-ci-tests

:white_check_mark: 0 Failed, 1556 Passed, 0 Skipped, 1m 54.48s Total duration (1m 30.03s time saved)

[teodor2312]

internal query that the selective re-run feature does

Just out of curiosity can you tell me what this is?

[Drarig29]

@teodor2312 this is a query to find the previous batches on the same commit