Fix lint error

[ymktmk]

Fixed multiple lint errors like the one below .

pkg/job/watcher.go:51:17: Error return value of `w.WatchPods` is not checked (errcheck)
  		go w.WatchPods(ctx, incrementalPodList)
  		              ^
  cmd/root.go:21:17: Error return value of `viper.BindPFlag` is not checked (errcheck)
  	viper.BindPFlag("config", RootCmd.PersistentFlags().Lookup("config"))
  	               ^
  pkg/job/watcher.go:[88](https://github.com/h3poteto/kube-job/actions/runs/12780562073/job/35627023901#step:3:93):2: S1000: should use a simple channel send/receive instead of `select` with a single case (gosimple)
  	select {
  	^
  pkg/job/watcher.go:133:2: S1008: should use 'return pod.Status.Phase == corev1.PodPending' instead of 'if pod.Status.Phase == corev1.PodPending { return true }; return false' (gosimple)
  	if pod.Status.Phase == corev1.PodPending {
  	^
  e2e/e2e_test.go:170:9: SA1019: wait.Poll is deprecated: This method does not return errors from context, use PollUntilContextTimeout. Note that the new method will no longer return ErrWaitTimeout and instead return errors defined by the context package. Will be removed in a future release. (staticcheck)
  	err := wait.Poll(10*time.Second, 10*time.Minute, func() (bool, error) {
  	       ^
  e2e/e2e_test.go:211:9: SA1019: wait.PollImmediate is deprecated: This method does not return errors from context, use PollUntilContextTimeout. Note that the new method will no longer return ErrWaitTimeout and instead return errors defined by the context package. Will be removed in a future release. (staticcheck)
  	return wait.PollImmediate(3*time.Second, 1*time.Minute, func() (bool, error) {
  	       ^
  pkg/job/job.go:11:2: SA1019: "io/ioutil" has been deprecated since Go 1.19: As of Go 1.16, the same functionality is now provided by package [io] or package [os], and those implementations should be preferred in new code. See the specific function documentation for details. (staticcheck)
  	"io/ioutil"
  	^

[ymktmk]

Added because the following error occurred

level=error msg="Timeout exceeded: try increasing it by passing --timeout option"

[h3poteto]

Thanks