Fixes SSO mapping (now requires name and ID to update)

[cmgrote]

Note

Introduces a new, mapping-based SSO update API and aligns tests to the new contract.

• Adds updateGroupMapping(SSOMapping, AtlanGroup, String[, RequestOptions]) that posts with both id and name, deriving URL and alias from the provided SSOMapping
• Deprecates old updateGroupMapping(String, AtlanGroup, String, String[, RequestOptions]) signatures
• Updates integration tests to call the new method and to always assert mapping.getName() contains the group ID (no longer null on update)

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