chore: Drop set_data

[sentrivana]

Remove last mention of set_data (it's commented out, but still).

Closes https://linear.app/getsentry/issue/PY-1946/deprecatedrop-set-data

[linear-code]

PY-1946

[github-actions]

Codecov Results 📊

✅ 66947 passed | ⏭️ 3292 skipped | Total: 70239 | Pass Rate: 95.31% | Execution Time: 215m 50s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -65213
Passed Tests	📉 -61374
Failed Tests	—
Skipped Tests	📉 -3839

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2256 uncovered lines.
❌ Project coverage is 89.51%. Comparing base (f9855c9) to head (67d75a0).

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
- Coverage    90.17%    89.51%    -0.66%
==========================================
  Files          193       180       -13
  Lines        25768     21512     -4256
  Branches      9532      7812     -1720
==========================================
+ Hits         23236     19256     -3980
- Misses        2532      2256      -276
- Partials      1432      1220      -212

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