chore: record error-tracking autocapture receiver in setup baseline

[rnegron]

Problem

Master has been red on Backend CI since feat(error-tracking): move autocapture opt-in to settings (phase 1) merged. That PR added a new post_save receiver (mirror_autocapture_opt_in_to_settings) that connects at django.setup(), but didn't record it in the committed startup-receiver baseline. test_setup_receivers_match_baseline pins the exact set of first-party receivers wired at setup, so the unrecorded one fails the guard on every master run.

Changes

• Add the one receiver line to posthog/test/setup_receivers_baseline.txt, in sorted position.

The receiver's wiring is already correct (import-light signals.py imported from ErrorTrackingConfig.ready() with # noqa: F401), and test_no_new_heavy_imports_at_setup still passes, so recording it is the right fix rather than restructuring.

How did you test this code?

• Reproduced the guard's django.setup() receiver capture in a clean subprocess and confirmed the updated 217-line baseline is a zero-diff exact match for the live receiver set.
• Did not run the full pytest test locally: my dev shell exports DEBUG=1, which leaks a settings warning onto the subprocess stdout and would false-fail the assertion. CI has no such artifact.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

• Raúl asked me (Claude, via Claude Code) to triage a red-master Slack alert and fix if possible.
• Invoked the /django-startup-time skill to confirm the guard's intent and that "record in baseline" (not defer/restructure) was the correct fix here.
• Verified the culprit commit, confirmed the receiver is import-light and ready()-wired, and validated the baseline diff before committing.

[greptile-apps]

_{Reviews (1): Last reviewed commit: "chore: record error-tracking autocapture..." | Re-trigger Greptile}

[github-actions]

🤖 CI report

⚠️ Playwright — 1 failed

🎭 Playwright report · View test results →

❌ 1 failed test:

• password-protected insight sharing (chromium)

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[rnegron]

Replaced by #70869