fix: use site LUID across site endpoints

[teesofttech]

Summary

• move DataSource, Permission, Project, User, and Group services onto the shared Tableau request builder
• build all site-scoped REST URLs with the signed-in site LUID instead of SiteContentUrl
• forward cancellation tokens through the migrated service APIs
• add regression tests proving migrated services use /sites/{site-luid}/... and send X-Tableau-Auth

Validation

• dotnet build TableauSharp.sln
• dotnet test TableauSharp.sln
• rg -n "SiteContentUrl|/sites/|sites/" src/TableauSharp

Stacked on #37 because this uses the auth/client foundation request builder.

Closes #22

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