Add Postgres user deletion script #6751

Job	Run time
build-and-check	2m 21s
test-integration-packages/billing	1m 2s
test-integration-packages/internal	1m 2s
test-integration-sdk	1m 31s
test-integration-packages/agent-runtime	42s
test-integration-common	39s
test-integration-cli	39s
test-integration-web	43s
test-.agents	39s
test-packages/agent-runtime	45s
test-common	41s
test-cli	51s
test-packages/internal	48s
test-packages/billing	39s
test-web	1m 9s
test-sdk	51s
	15m 2s

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