Edx-arch-experiments

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Added
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* Added celery lifecycle logging for Datadog diagnostics, to be enabled using ``DATADOG_DIAGNOSTICS_CELERY_LOG_SIGNALS``.

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Fixed
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* Fixed loading of ``DATADOG_DIAGNOSTICS_ENABLE``, which was previously not loaded properly and therefore was always True. Also fixed loading of ``DATADOG_DIAGNOSTICS_MAX_SPANS``, which was presumably broken as well.

Removed
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* Removed early span-start logging. It never worked properly, possibly because workers are continually being destroyed and created, leading to high log volume.

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Changed
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* Datadog diagnostics will now log all span-starts for the first minute after server startup
* **WARNING**: Do not use this version; see 4.2.0 release notes.

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Changed
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* Dropped support for Python 3.8; only testing with 3.11 and above now.

Added
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* ``DatadogDiagnosticMiddleware`` can now detect and log anomalous traces, enabled by Waffle flag ``datadog.diagnostics.detect_anomalous_trace``

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Added
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* New middleware ``edx_arch_experiments.datadog_diagnostics.middleware.DatadogDiagnosticMiddleware`` for logging diagnostics on traces in Datadog.

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Changed
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* Added ``federated-content-connector`` to the generate_code_owners script.