fix(postgres): randomize test username and update grant tests #4259

Job	Run time
changes	5s
test-dbt-versions (1.10)	1m 44s
test-dbt-versions (1.9)	1m 47s
test-dbt-versions (1.6)	1m 39s
test-dbt-versions (1.8)	1m 28s
test-dbt-versions (1.4)	1m 21s
test-dbt-versions (1.5)	1m 33s
test-dbt-versions (1.3)	1m 40s
test-dbt-versions (1.7)	1m 25s
test-vscode	0s
test-vscode-e2e	0s
style-and-cicd-tests (3.10)	24m 28s
doc-tests	30s
style-and-cicd-tests (3.11)	22m 35s
cicd-tests-windows	9m 39s
style-and-cicd-tests (3.9)	23m 42s
style-and-cicd-tests (3.13)	22m 6s
style-and-cicd-tests (3.12)	25m 29s
engine-tests-docker (mysql)	1m 47s
engine-tests-docker (duckdb)	1m 41s
engine-tests-docker (risingwave)	2m 27s
engine-tests-docker (clickhouse)	2m 54s
engine-tests-docker (trino)	8m 0s
migration-test	1m 24s
engine-tests-docker (postgres)	2m 22s
engine-tests-docker (spark)	5m 19s
engine-tests-docker (mssql)	1m 53s
engine-tests-docker (starrocks)	2m 34s
ui-style	-1s
ui-test	-1s
engine-tests-cloud	0s
	2h 51m 30s

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