[Test Improver] Add unit tests for shell/utils/auth.js utility functions

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🤖 This PR was created by Test Improver, an automated AI assistant focused on improving test coverage.

Goal and Rationale

shell/utils/auth.js is a critical utility module used in authentication flows across Rancher Dashboard. It had zero test coverage. This module contains several functions with genuine branching logic that benefit from tests:

• parseAuthProvidersInfo — filters and categorises auth providers; determines the "enabled location" for the single active provider. Multiple filter branches and a null-vs-object decision for enabledLocation.
• canViewResource — guards resource views based on store schemas and virtual-resource checks. 5 distinct return paths.
• notLoggedIn — commits auth state and conditionally commits a redirect target, then picks between two redirect destinations.
• checkPermissions — async function that builds a permissions hash by walking types and checking schemas against schemaValidator, resourceMethods, or collectionMethods matchers.

Approach

• Focused on functions with real branching logic (not trivial one-liners).
• parseAuthProvidersInfo tested with pure data fixtures — no store required.
• canViewResource and notLoggedIn tested with minimal jest.fn() mocks.
• checkPermissions tested end-to-end (awaiting the resolved Promise) covering all 5 execution paths.
• Used it.each with named-object entries for table-driven variants.
• Followed project conventions: lowercase describe/it names, toStrictEqual, toHaveBeenCalledWith.

Coverage Impact

Metric	Before	After
Tests added	0	24
Test suites	0	1

Test Status

PASS shell/utils/__tests__/auth.test.ts
Tests: 24 passed, 24 total

Lint: ✅ No warnings (eslint --max-warnings 0)

Reproducibility

yarn install --frozen-lockfile
yarn test:ci --testPathPattern=shell/utils/__tests__/auth.test.ts

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