docs: Add changes to migration guide

[sentrivana]

Description

Issues

Reminders

• Please add tests to validate your changes, and lint your code using uv run ruff.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Codecov Results 📊

✅ 98677 passed | ❌ 3 failed | ⏭️ 6805 skipped | Total: 105485 | Pass Rate: 93.55% | Execution Time: 350m 49s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +171
Passed Tests	📈 +119
Failed Tests	📈 +3
Skipped Tests	📈 +49

➕ New Tests (2)

View new tests

• test_continuous_profiler_auto_start_and_stop_sampled[non-experiment-thread]
  • File: tests.profiler.test_continuous_profiler
  • Status: ❌ Failing
• test_continuous_profiler_auto_start_and_stop_sampled[experiment-gevent]
  • File: tests.profiler.test_continuous_profiler
  • Status: ❌ Failing

❌ Failed Tests

test_continuous_profiler_auto_start_and_stop_sampled[non-experiment-thread]

File: tests.profiler.test_continuous_profiler
Suite: py3.6-common
Error: AssertionError: profiler should not be running assert '332198442de645c4b8ca9fccf2495e06' is None + where '332198442de645c4b8ca9fccf2495e06' = get_profiler_id()

Stack Trace

tests/profiler/test_continuous_profiler.py:812: in test_continuous_profiler_auto_start_and_stop_sampled
    assert get_profiler_id() is None, "profiler should not be running"
E   AssertionError: profiler should not be running
E   assert '332198442de645c4b8ca9fccf2495e06' is None
E    +  where '332198442de645c4b8ca9fccf2495e06' = get_profiler_id()

test_continuous_profiler_auto_start_and_stop_sampled[experiment-gevent]

File: tests.profiler.test_continuous_profiler
Suite: py3.6-gevent
Error: AssertionError: profiler should not be running assert 'b2dd9f155352412b935d1e6439ce83ee' is None + where 'b2dd9f155352412b935d1e6439ce83ee' = get_profiler_id()

Stack Trace

tests/profiler/test_continuous_profiler.py:812: in test_continuous_profiler_auto_start_and_stop_sampled
    assert get_profiler_id() is None, "profiler should not be running"
E   AssertionError: profiler should not be running
E   assert 'b2dd9f155352412b935d1e6439ce83ee' is None
E    +  where 'b2dd9f155352412b935d1e6439ce83ee' = get_profiler_id()

✅ Patch coverage is 100.00%. Project has 2552 uncovered lines.
❌ Project coverage is 89.59%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    89.84%    89.59%    -0.25%
==========================================
  Files          193       193         —
  Lines        24588     24509       -79
  Branches      8744      8674       -70
==========================================
+ Hits         22089     21957      -132
- Misses        2499      2552       +53
- Partials      1400      1400         —

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