fix(cli)!: protect client Logger and refactor cli scaletest tests (#8317)

- (breaking) Protects Logger and LogBodies fields of codersdk.Client with its mutex. This addresses a data race in cli/scaletest.
- Fillets the existing cli/createworkspaces unit test and moves the testing logic there into the tests under scaletest/createworkspaces.
- Adds testutil.RaceEnabled bool const and conditionaly skips previously-skipped tests under scaletest/ if the race detector is enabled. This is unfortunate and sad, but I would prefer to have these tests at least running without the race detector than not running at all.
- Adds IgnoreErrors option to fake in-memory agent loggers; having the agents fail the test immediately when they encounter any sort of error isn't really helpful.

enterprise/coderd/appearance_test.go

@@ -8,6 +8,8 @@ import (
 
 	"github.com/stretchr/testify/require"
 
+	"github.com/google/uuid"
+
 	"github.com/coder/coder/cli/clibase"
 	"github.com/coder/coder/coderd/coderdtest"
 	"github.com/coder/coder/codersdk"
@@ -17,7 +19,6 @@ import (
 	"github.com/coder/coder/enterprise/coderd/license"
 	"github.com/coder/coder/provisioner/echo"
 	"github.com/coder/coder/testutil"
-	"github.com/google/uuid"
 )
 
 func TestServiceBanners(t *testing.T) {