[JS] chore: rename auth sample folders (#854)

## Linked issues

closes: #853

## Details

1. Rename auth samples in following rules:
1. 06.auth.oauth.xxx represents samples built with OAuth Connection in
Azure Bot Service
2. 06.auth.teamsSSO.xxx represents samples built with the TeamsFx way
that depends on Teams SSO
2. Update readme to introduce the difference

## Attestation Checklist

- [x] My code follows the style guidelines of this project

- I have checked for/fixed spelling, linting, and other errors
- I have commented my code for clarity
- I have made corresponding changes to the documentation (we use
[TypeDoc](https://typedoc.org/) to document our code)
- My changes generate no new warnings
- I have added tests that validates my changes, and provides sufficient
test coverage. I have tested with:
  - Local testing
  - E2E testing in Teams
- New and existing unit tests pass locally with my changes

Author: blackchoey