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/server_test.go

@@ -348,9 +348,6 @@ func TestServer(t *testing.T) {
 
 		runGitHubProviderTest := func(t *testing.T, tc testCase) {
 			t.Parallel()
-			if !dbtestutil.WillUsePostgres() {
-				t.Skip("test requires postgres")
-			}
 
 			ctx, cancelFunc := context.WithCancel(testutil.Context(t, testutil.WaitLong))
 			defer cancelFunc()
@@ -2142,10 +2139,6 @@ func TestServerYAMLConfig(t *testing.T) {
 func TestConnectToPostgres(t *testing.T) {
 	t.Parallel()
 
-	if !dbtestutil.WillUsePostgres() {
-		t.Skip("this test does not make sense without postgres")
-	}
-
 	t.Run("Migrate", func(t *testing.T) {
 		t.Parallel()
 
@@ -2256,10 +2249,6 @@ type runServerOpts struct {
 func TestServer_TelemetryDisabled_FinalReport(t *testing.T) {
 	t.Parallel()
 
-	if !dbtestutil.WillUsePostgres() {
-		t.Skip("this test requires postgres")
-	}
-
 	telemetryServerURL, deployment, snapshot := mockTelemetryServer(t)
 	dbConnURL, err := dbtestutil.Open(t)
 	require.NoError(t, err)