[Feedback] Update Custom Auth Flow examples for both PasswordFull and PasswordLess Lambda examples

**Page**: [`/lib/auth/switch-auth/q/platform/[platform]`](https://docs.amplify.aws/lib/auth/switch-auth/q/platform/js)

**Feedback**:
The Define Auth and Create Auth Lambda samples shown only work for password-less login when using `CUSTOM_AUTH`. Need to update to show Lambda samples for password-full login.

https://github.com/aws-amplify/amplify-js/issues/3159#issuecomment-1604495872

Open the JavaScript page at /lib/auth/switch-auth/q/platform/js and compare the Define Auth and Create Auth Lambda samples with the linked amplify-js discussion. Update the examples to cover both password-full and password-less CUSTOM_AUTH flows, then verify that both sets of samples are represented on the page.

Written by the indexing model from the issue text.