Add Postgres user deletion script (#744) #825

Job	Run time
build-and-smoke-freebuff-windows	2m 42s
build-freebuff	1m 18s
e2e-ads-behavior	1m 4s
e2e-terminal-command	1m 8s
e2e-startup	1m 0s
e2e-slash-commands	1m 1s
e2e-code-edit	1m 2s
e2e-version	53s
e2e-help-command	1m 4s
e2e-agent-startup	2m 10s
	13m 22s

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