test(profiler): Wait for automatic shutdown

[sentry-junior]

The automatic profiler lifecycle shuts down asynchronously after inactive profiles are observed by the sampler. Replace the fixed 200 ms sleeps with a bounded wait for both shutdown and the resulting profile chunk, so loaded CI workers cannot race the assertion.

Requested by neel.

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View Junior Session [Sentry]

[github-actions]

Codecov Results 📊

✅ 130585 passed | ⏭️ 7110 skipped | Total: 137695 | Pass Rate: 94.84% | Execution Time: 465m 50s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	—
Failed Tests	—
Skipped Tests	—

✨ No test changes detected

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2509 uncovered lines.
✅ Project coverage is 90.24%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    90.24%    90.24%        —%
==========================================
  Files          193       193         —
  Lines        25715     25715         —
  Branches      9502      9502         —
==========================================
+ Hits         23206     23206         —
- Misses        2509      2509         —
- Partials      1435      1433        -2

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