Make more granular SSH tests for both Policies

[kradalby]

[ghost]

Pull Request Revisions

Revision	Description
r8	Removed duplicate import in test file Eliminated a redundant import of the matcher package in the policy_test.go file
r7	SSH policy reworked with new validation Comprehensive refactoring of SSH policy validation with stricter rules, improved autogroup handling, and enhanced error checking across policy sources, destinations, and users.
r6	Updated Nixpkgs flake lock Upgraded Nixpkgs dependency to a newer commit with updated hash and modified lastModified timestamp
r5	Modified autogroup validation logic Updated autogroup validation to check against a new unsupported autogroups slice instead of previous containment checks
r4	Removed autogroup:nonroot from SSH policy Updated SSH policy test case by removing autogroup:nonroot from users and test case configurations
r3	SSH policy reworked for consistency Updated SSH policy to align with Tailscale upstream, modifying test cases to use specific user destinations instead of groups
r2	Skipped SSH policy test cases Added skipV1: true to multiple SSH policy test cases due to broken group implementation in v1
r1	Added comprehensive SSH policy tests Expanded SSH policy testing in policy_test.go with multiple scenarios for SSH rule matching, validation, and policy generation across different user and tag configurations

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✅ AI review completed for r8

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