feat(co): enable by default

[P403n1x87]

Description

We have gathered enough internal data to be confident that we can enable Code Origin for Spans by default and make it opt-out.

[cit-pr-commenter-54b7da]

Codeowners resolved as

ddtrace/internal/settings/code_origin.py                                @DataDog/apm-core-python
releasenotes/notes/feat-co-default-on-c5db08604c577a85.yaml             @DataDog/apm-python
tests/telemetry/test_telemetry.py                                       @DataDog/apm-python
tests/telemetry/test_writer.py                                          @DataDog/apm-python

[datadog-prod-us1-6]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: ddf885e | Docs | Datadog PR Page | Was this helpful? React with 👍/👎 or give us feedback!}