feat(coderd/database/dbtestutil): set default database timezone to non-UTC in unit tests (#9672)

- Adds dbtestutil.WithTimezone(tz) to allow setting the timezone for a test database.
- Modifies our test database setup code to pick a consistently weird timezone for the database.
- Adds the facility randtz.Name() to pick a random timezone which is consistent across subtests (via sync.Once).
- Adds a linter rule to warn against setting the test database timezone to UTC.

enterprise/coderd/workspaces_test.go

@@ -15,6 +15,7 @@ import (
 	"github.com/coder/coder/v2/coderd/autobuild"
 	"github.com/coder/coder/v2/coderd/coderdtest"
 	"github.com/coder/coder/v2/coderd/database"
+	"github.com/coder/coder/v2/coderd/database/dbtestutil"
 	agplschedule "github.com/coder/coder/v2/coderd/schedule"
 	"github.com/coder/coder/v2/coderd/schedule/cron"
 	"github.com/coder/coder/v2/coderd/util/ptr"
@@ -641,9 +642,14 @@ func TestWorkspacesFiltering(t *testing.T) {
 
 		dormantTTL := 24 * time.Hour
 
+		// nolint:gocritic // https://github.com/coder/coder/issues/9682
+		db, ps := dbtestutil.NewDB(t, dbtestutil.WithTimezone("UTC"))
+
 		client, user := coderdenttest.New(t, &coderdenttest.Options{
 			Options: &coderdtest.Options{
 				IncludeProvisionerDaemon: true,
+				Database:                 db,
+				Pubsub:                   ps,
 			},
 			LicenseOptions: &coderdenttest.LicenseOptions{
 				Features: license.Features{