Remove DataDog from CI #15680

Job	Run time
docker, python:3.9	5m 13s
docker, python:3.10	5m 9s
docker, python:3.11	4m 56s
docker, python:3.12	5m 30s
Server Tests - python:3.9, postgres:14	3m 36s
Server Tests - python:3.10, postgres:14	3m 41s
Server Tests - python:3.11, postgres:14	3m 27s
Server Tests - python:3.12, postgres:14	3m 48s
Server Tests - python:3.9, sqlite	4m 46s
Server Tests - python:3.10, sqlite	4m 46s
Server Tests - python:3.11, sqlite	4m 38s
Server Tests - python:3.12, sqlite	5m 11s
Client Tests - python:3.9, postgres:14	6m 22s
Client Tests - python:3.10, postgres:14	6m 26s
Client Tests - python:3.11, postgres:14	6m 6s
Client Tests - python:3.12, postgres:14	6m 18s
notify-tests-failing-on-main	0s
	1h 19m 53s

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