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.

cli/root.go

@@ -543,7 +543,7 @@ func (r *RootCmd) InitClient(client *codersdk.Client) clibase.MiddlewareFunc {
 
 			if r.debugHTTP {
 				client.PlainLogger = os.Stderr
-				client.LogBodies = true
+				client.SetLogBodies(true)
 			}
 			client.DisableDirectConnections = r.disableDirect