feat: upgrade to okta sdk v6

[sgtoj]

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[Copilot]

Pull request overview

This PR upgrades the Okta SDK from v2 to v6, requiring significant changes to adapt to the new SDK's API structure and data types. The upgrade necessitates handling profile types differently (supporting both OktaUserGroupProfile and OktaActiveDirectoryGroupProfile) and using getter methods instead of direct field access.

• Migration from Okta SDK v2 to v6 with updated import paths and API client initialization
• Refactored group and user data access to use getter methods and handle multiple profile types
• Updated test fixtures to include additional required fields for v6 SDK compatibility

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

File	Description
go.mod	Updates Okta SDK dependency from v2.20.0 to v6.0.1 and associated transitive dependencies
internal/okta/client.go	Refactors client initialization for v6 SDK, adds custom server configuration for testing, and updates API method calls to use new v6 patterns
internal/okta/groups.go	Changes group handling to support multiple profile types and uses getter methods instead of direct field access
fixtures/scenarios.json	Expands test fixture JSON responses with additional required fields for v6 SDK compatibility

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