chore: remove references to dbtestutil.WillUsePostgres (#20436)

Addresses https://github.com/coder/internal/issues/758.

This PR only cleans up dead code, it makes no changes to test logic.

enterprise/cli/server_dbcrypt_test.go

@@ -24,10 +24,6 @@ import (
 //
 // nolint: paralleltest // use of t.Setenv
 func TestServerDBCrypt(t *testing.T) {
-	if !dbtestutil.WillUsePostgres() {
-		t.Skip("this test requires a postgres instance")
-	}
-
 	ctx, cancel := context.WithCancel(context.Background())
 	t.Cleanup(cancel)