🐛 Fix flaky stylesheet rules test

[sethfowler-datadog]

Motivation

The captures stylesheet rules test in record.spec.ts is flaky. Let's try to fix that.

Changes

There are two factors that seem to contribute to this test's flakiness:

1. It uses the real setTimeout(), rather than a mock clock, so it's sensitive to sometimes-unpredictable timing in CI.
2. It expects an exact sequence of records, instead of just checking that all of the records it expects are present. If another tracker happens to emit a record that's not part of the assertion, the test fails.

This PR fixes both issues:

1. The test has been converted to use mockClock().
2. The test now filters the records it receives, and only asserts against the kinds of records it's actually interested in.

Locally, the new version seems to be solid; I'm hoping this will fix the flakiness in CI.

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[sethfowler-datadog]

/merge

[gh-worker-devflow-routing-ef8351]

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2026-06-18 13:49:42 UTC ℹ️ Start processing command /merge

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2026-06-18 13:49:47 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in main is approximately 26m (p90).

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2026-06-18 14:06:03 UTC ℹ️ MergeQueue: This merge request was merged