chore: add comprehensive tests for pagination and permissions in metrics module

[kallilsouza]

What

• Added comprehensive unit tests across multiple modules to increase test coverage:
  • Authentication: Tests for ProjectAuthBodyPermission, ProjectQueryParamPermission, FeatureFlagPermission, OIDC logout (get_oidc_logout_url, admin_oidc_logout), and AdminOIDCAuthenticationBackend
  • Core pagination: Tests for get_cursor_based_pagination_urls and get_limit_offset_pagination_urls proxy pagination utilities
  • Human support services: Tests for filter normalization (scalar-to-list coercion), detailed monitoring endpoints (on-going, awaiting, agents, status), volume by queue/tag, CSAT ratings, analysis status, and finished rooms formatting
  • Human support views: Tests for v1 and v2 detailed monitoring views (on-going, awaiting, agents, status, agents totals, analysis status) covering authentication, authorization, and happy-path scenarios
  • Conversations tasks: Tests for generate_conversations_report (concurrency limits, interrupted reports, pending report selection, error handling), timeout_reports, and check_project_sales_funnel_on_datalake
  • Meta permissions: Tests for ProjectWABAPermission and ProjectDashboardWABAPermission
  • Meta tasks: Tests for check_dashboards_marketing_messages_status_for_project (dispatch logic, skip conditions, exception handling) and check_marketing_messages_status (config updates, guard clauses)

Why

• Existing test coverage was insufficient, leaving critical business logic paths (permissions, background tasks, service layer filters, and API views) unverified and prone to regressions