ci: mark some unreliable tests

[emmettbutler]

Marking recently-failed tests

https://app.circleci.com/pipelines/github/DataDog/dd-trace-py/62400/workflows/eddd6d71-2921-41de-8b17-4a43d22ce511/jobs/3891138
https://app.circleci.com/pipelines/github/DataDog/dd-trace-py/62385/workflows/19270a5d-be1d-4007-bdcb-8711682e4e6d/jobs/3890437

Checklist

• Change(s) are motivated and described in the PR description
• Testing strategy is described if automated tests are not included in the PR
• Risks are described (performance impact, potential for breakage, maintainability)
• Change is maintainable (easy to change, telemetry, documentation)
• Library release note guidelines are followed or label changelog/no-changelog is set
• Documentation is included (in-code, generated user docs, public corp docs)
• Backport labels are set (if applicable)
• If this PR changes the public interface, I've notified @DataDog/apm-tees.

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: emmett.butler/flaky-tests-may
Commit report: f4deea1
Test service: dd-trace-py

✅ 0 Failed, 98 Passed, 1810 Skipped, 8m 25.36s Total duration (3m 1.35s time saved)

[emmettbutler]

@P403n1x87 are you ok with this change?

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-06-10 18:17:51

Comparing candidate commit f4deea1 in PR branch emmett.butler/flaky-tests-may with baseline commit 1e22549 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 221 metrics, 9 unstable metrics.