Tests: sleep test using bigger time steps

Since every mocked clock time step also waits for 1ms to give other
goroutines a chance to run, it took too much wallclock time to mock-sleep
for 47 seconds with 100ms increments.

Stepping the mocked clock with 1s increments makes the test 10x faster.

internal/worker/command_misc_test.go

@@ -76,7 +76,7 @@ func TestCommandSleep(t *testing.T) {
 		close(runDone)
 	}()
 
-	timeStepSize := 100 * time.Millisecond
+	timeStepSize := 1 * time.Second
 loop:
 	for {
 		select {