ref: Drop support for legacy failed_request_status_codes format in new major

[sentrivana]

Description

When failed_request_status_codes was first introduced, it accepted a different format. The format was then changed, while the old format was deprecated. Drop support for the old format now.

Issues

Closes #5017

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 📊

✅ 96291 passed | ❌ 2 failed | ⏭️ 6337 skipped | Total: 102630 | Pass Rate: 93.82% | Execution Time: 362m 54s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -3026
Passed Tests	📉 -2587
Failed Tests	📈 +1
Skipped Tests	📉 -440

➕ New Tests (2)

View new tests

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

❌ Failed Tests

test_continuous_profiler_auto_start_and_stop_sampled_span_streaming[non-experiment-thread]

File: tests.profiler.test_continuous_profiler
Suite: py3.14t-common
Error: AssertionError: profiler should not be running assert '7df33b3ce9454a4396839a1657385e44' is None + where '7df33b3ce9454a4396839a1657385e44' = get_profiler_id()

Stack Trace

tests/profiler/test_continuous_profiler.py:896: in test_continuous_profiler_auto_start_and_stop_sampled_span_streaming
    assert get_profiler_id() is None, "profiler should not be running"
E   AssertionError: profiler should not be running
E   assert '7df33b3ce9454a4396839a1657385e44' is None
E    +  where '7df33b3ce9454a4396839a1657385e44' = get_profiler_id()

test_continuous_profiler_auto_start_and_stop_sampled_span_streaming[experiment-thread]

File: tests.profiler.test_continuous_profiler
Suite: py3.7-common
Error: AssertionError: profiler should not be running assert '9bdf33d22cac44c28a0358e1ec1e0739' is None + where '9bdf33d22cac44c28a0358e1ec1e0739' = get_profiler_id()

Stack Trace

tests/profiler/test_continuous_profiler.py:896: in test_continuous_profiler_auto_start_and_stop_sampled_span_streaming
    assert get_profiler_id() is None, "profiler should not be running"
E   AssertionError: profiler should not be running
E   assert '9bdf33d22cac44c28a0358e1ec1e0739' is None
E    +  where '9bdf33d22cac44c28a0358e1ec1e0739' = get_profiler_id()

✅ Patch coverage is 100.00%. Project has 2392 uncovered lines.
✅ Project coverage is 89.87%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.87%    89.87%        —%
==========================================
  Files          193       186        -7
  Lines        24656     23615     -1041
  Branches      8786      8450      -336
==========================================
+ Hits         22158     21223      -935
- Misses        2498      2392      -106
- Partials      1400      1347       -53

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