ref: Remove propagate_traces in new major

[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 📊

✅ 96647 passed | ❌ 2 failed | ⏭️ 6336 skipped | Total: 102985 | Pass Rate: 93.85% | Execution Time: 343m 7s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -2671
Passed Tests	📉 -2231
Failed Tests	📈 +1
Skipped Tests	📉 -441

➕ New Tests (1)

View new tests

• test_span_origin
  • File: tests.integrations.aws_lambda.test_aws_lambda
  • Status: ❌ Failing

❌ Failed Tests

test_span_origin

File: tests.integrations.aws_lambda.test_aws_lambda
Suite: py3.8-aws_lambda
Error: KeyError: 'contexts'

Stack Trace

tests/integrations/aws_lambda/test_aws_lambda.py:895: in test_span_origin
    transaction_event["contexts"]["trace"]["origin"] == "auto.function.aws_lambda"
E   KeyError: 'contexts'

✅ Patch coverage is 100.00%. Project has 2400 uncovered lines.
❌ Project coverage is 89.85%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    89.87%    89.85%    -0.02%
==========================================
  Files          193       186        -7
  Lines        24656     23638     -1018
  Branches      8786      8462      -324
==========================================
+ Hits         22158     21238      -920
- Misses        2498      2400       -98
- Partials      1400      1345       -55

---

Generated by Codecov Action