Add query source to DB spans #3773

Job	Run time
pymongo, python 3.6, ubuntu-20.04	1m 30s
pymongo latest, python 3.7, ubuntu-20.04	44s
pymongo, python 3.7, ubuntu-20.04	1m 35s
pymongo latest, python 3.8, ubuntu-20.04	43s
pymongo, python 2.7, ubuntu-20.04	1m 27s
pymongo, python 3.8, ubuntu-20.04	1m 33s
pymongo latest, python 3.9, ubuntu-20.04	41s
pymongo, python 3.9, ubuntu-20.04	1m 42s
pymongo latest, python 3.10, ubuntu-20.04	46s
pymongo, python 3.10, ubuntu-20.04	1m 18s
pymongo latest, python 3.11, ubuntu-20.04	39s
pymongo, python 3.11, ubuntu-20.04	1m 17s
pymongo latest, python 3.12, ubuntu-20.04	56s
pymongo, python 3.12, ubuntu-20.04	1m 20s
All pymongo tests passed or skipped	1s
	16m 12s

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