Set authSetting when creating users via the Tableau REST API

[aberoham]

Fixes #27.

AddUserToSite sets idpConfigurationId but never includes authSetting in the API payload. The Tableau REST API requires authSetting to be explicitly set — without it, every user defaults to "Tableau with MFA" regardless of the IdP configuration provided.

• CreateAccount now sets AuthSetting to "SAML" when an IdP is selected, "TableauIDWithMFA" otherwise.
• AddUserToSite now passes AuthSetting through to the API payload when set, rather than silently dropping it.

Tested against the Tableau Cloud REST API (3.17); both SAML and TableauIDWithMFA are correctly reflected on the created user.

Summary by CodeRabbit

• New Features
  • Explicit authentication method selection during account provisioning. Accounts using IDP configuration are now automatically set to SAML authentication; others default to Tableau ID with MFA.

[coderabbitai]

Walkthrough

The changes add explicit authentication setting configuration for user provisioning. When creating users, the code now populates the authentication method field based on IDP configuration presence—"SAML" when an IDP is provided, "TableauIDWithMFA" otherwise.

Changes

Cohort / File(s)	Summary
Authentication Setting Configuration pkg/connector/user.go, pkg/tableau/client.go	Added logic to set AuthSetting field conditionally: "SAML" for IDP-configured users, "TableauIDWithMFA" for standard authentication. Ensures authentication method is explicitly included in user creation payloads.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A user springs forth with SAML's grace,
Or MFA arms for the standard case,
No more silent settings, now explicit and clear,
Authentication paths that the API can hear!
🔐✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: setting the authSetting field when creating users via the Tableau REST API.
Linked Issues check	✅ Passed	The PR fully addresses the requirements from issue #27: CreateAccount now sets AuthSetting based on IdP presence, and AddUserToSite now includes AuthSetting in the API payload.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to fixing issue #27; modifications to CreateAccount and AddUserToSite align with the linked issue objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

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