parametric: flush finished otel spans when APMLibrary contextmanager exits #22173

Job	Run time
Test the test	27s
lint	16s
Exotics scenarios	0s
Get impacted libraries / main	6s
Get scenarios and groups / main	21s
get_dev_artifacts (cpp)	3s
get_dev_artifacts (dotnet)	11s
get_dev_artifacts (golang)	4s
get_dev_artifacts (java)	11s
get_dev_artifacts (nodejs)	7s
get_dev_artifacts (php)	48s
get_dev_artifacts (python)	6s
get_dev_artifacts (ruby)	4s
System Tests	0s
Ruby Docker Mode	0s
fancy-report	7s
Update CI Visibility Dashboard	0s
	2m 51s

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