User Groups GA docs updates

[AdamBouhmad]

Summary

Docs updates for User Groups & SCIM User Groups ahead of the GA on June 23rd. Includes updates to labels, removal of references to Beta/opting-in flows, and a few fixes for code snippets.

Please hold off on merging until 11am PST

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PR Change Summary

Updated documentation for User Groups and SCIM User Groups in preparation for the General Availability release.

• Changed label from 'Beta' to 'New' for User Groups documentation.
• Removed references to Beta and opting-in flows for User Groups.
• Fixed code snippets for SCIM setup.

Modified Files

• src/content/docs/fundamentals/account/account-security/scim-setup/entra.mdx
• src/content/docs/fundamentals/manage-members/user-groups.mdx

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