Add Postgres user deletion script #6750

Job	Run time
build-and-check	2m 54s
test-integration-packages/billing	1m 9s
test-integration-packages/internal	1m 8s
test-integration-packages/agent-runtime	39s
test-integration-sdk	1m 28s
test-integration-cli	50s
test-integration-common	45s
test-integration-web	39s
test-common	50s
test-packages/billing	53s
test-cli	1m 3s
test-packages/agent-runtime	50s
test-sdk	53s
test-packages/internal	46s
test-.agents	42s
test-web	1m 4s
	16m 33s

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