feat: support SAML-native (#395)

This PR implements support for Ory's native SAML integration by adding
new Storybook stories and updating the filtering logic in the social
buttons form.

- Added new Storybook stories for two-step registration, one-step
registration, and first factor login using SAML.
- Updated the filtering logic in the social form component to include
SAML nodes alongside OIDC nodes.

Author: aeneasr