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.

cli/delete_test.go

@@ -185,9 +185,6 @@ func TestDelete(t *testing.T) {
 
 	t.Run("WarnNoProvisioners", func(t *testing.T) {
 		t.Parallel()
-		if !dbtestutil.WillUsePostgres() {
-			t.Skip("this test requires postgres")
-		}
 
 		store, ps, db := dbtestutil.NewDBWithSQLDB(t)
 		client, closeDaemon := coderdtest.NewWithProvisionerCloser(t, &coderdtest.Options{
@@ -228,9 +225,6 @@ func TestDelete(t *testing.T) {
 
 	t.Run("Prebuilt workspace delete permissions", func(t *testing.T) {
 		t.Parallel()
-		if !dbtestutil.WillUsePostgres() {
-			t.Skip("this test requires postgres")
-		}
 
 		// Setup
 		db, pb := dbtestutil.NewDB(t, dbtestutil.WithDumpOnFailure())