ci(build): use bash instead of zsh on tart macOS runners

[alee1246]

Description

Follow-up to #17501. It was requested in the past to use bash over zsh in the jobs using that tart runners.

Sets TART_EXECUTOR_SHELL="/bin/bash -l" on the tart macOS jobs so the gitlab-tart-executor runs bash instead of the VM's default zsh.

This removes the zsh-specific workarounds that were added when the tart runners were introduced:

• setopt shwordsplit in build macos arm64's before_script
• FF_SCRIPT_SECTIONS: "false" on build macos arm64 and os tests macos (disabled because GitLab's collapsible script-section wrapper was incompatible with zsh)

Also renames the runner tag from macos:sonoma-tart to macos:tart.

Testing

• CI pipeline passes with build macos arm64 and os tests macos running under bash on macos:tart runners

Additional Notes

CI-only change, no user-facing impact — will add the changelog/no-changelog label.

🤖 Generated with Claude Code

[cit-pr-commenter-54b7da]

Circular import analysis

⚠️ Existing circular imports

There are 4974 circular imports that already exist on the base branch and have not been changed by this PR.

Show existing cycles (showing 5 of 4974 shortest)

ddtrace.internal.datastreams -> ddtrace.internal.datastreams.aiokafka -> ddtrace.internal.datastreams
ddtrace.internal.core -> ddtrace._trace.span -> ddtrace.internal.core
ddtrace.internal.datastreams -> ddtrace.internal.datastreams.botocore -> ddtrace.internal.datastreams
ddtrace.internal.datastreams -> ddtrace.internal.datastreams.google_cloud_pubsub -> ddtrace.internal.datastreams
ddtrace.internal.datastreams -> ddtrace.internal.datastreams.kafka -> ddtrace.internal.datastreams

To see all cycles, download the cycles-base.json and cycles-pr.json artifacts from this CI job and run:

uv run --script scripts/import-analysis/cycles.py compare cycles-base.json cycles-pr.json

[cit-pr-commenter-54b7da]

Codeowners resolved as

.gitlab/multi-os-tests.yml                                              @DataDog/python-guild @DataDog/apm-core-python
.gitlab/package.yml                                                     @DataDog/python-guild @DataDog/apm-core-python

[datadog-prod-us1-5]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog retried 8 tests - 8 passed on retry

🚧 6 tests that failed were ignored due to quarantine

🔄 Datadog auto-retried 1 job - 1 passed on retry

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 4b8e682 | Docs | Datadog PR Page | Give us feedback!}

[pr-commenter]

Benchmarks

Benchmark execution time: 2026-07-10 18:54:07

Comparing candidate commit 4b8e682 in PR branch alee1246/CIEXE/tart-bash-shell with baseline commit 67093e6 in branch main.

Found 0 performance improvements and 5 performance regressions! Performance is the same for 614 metrics, 10 unstable metrics.

scenario:iastaspects-stringio_noaspect

• 🟥 execution_time [+37.224µs; +42.854µs] or [+9.826%; +11.313%]

scenario:iastaspectsospath-ospathbasename_aspect

• 🟥 execution_time [+90.159µs; +100.943µs] or [+20.993%; +23.504%]

scenario:iastaspectssplit-rsplit_aspect

• 🟥 execution_time [+13.100µs; +20.426µs] or [+8.617%; +13.437%]

scenario:span-start

• 🟥 execution_time [+1.201ms; +1.390ms] or [+7.764%; +8.988%]

scenario:telemetryaddmetric-1-count-metric-1-times

• 🟥 execution_time [+161.542ns; +191.027ns] or [+7.412%; +8.765%]