fix(llmobs): add parent ID handling for integration-generated spans #47839

Job	Run time
build-and-publish-latest-snapshot-image	0s
test_unit (dd-lib-python-init-test-django)	3m 32s
test_unit (dd-lib-python-init-test-django-gunicorn)	3m 15s
test_unit (dd-lib-python-init-test-django-gunicorn-alpine)	3m 21s
test_unit (dd-lib-python-init-test-django-uvicorn)	3m 29s
test_unit (dd-lib-python-init-test-django-no-perms)	4m 51s
test_unit (dd-lib-python-init-test-django-pre-installed)	3m 37s
test_unit (dd-lib-python-init-test-django-unsupported-python)	3m 51s
build-and-publish-test-image / wait_for_package	9s
build-and-publish-test-image / build_push / build_push	12m 47s
test-runner-test (dd-lib-python-init-test-django)	5m 39s
test-runner-test (dd-lib-python-init-test-django-gunicorn)	4m 47s
test-runner-test (dd-lib-python-init-test-django-uvicorn)	4m 10s
	53m 28s

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