Test reorganization with hspec-like naming and consistent job prefixes

Summary

This release reorganizes the test suite to use hspec-like naming conventions and implements consistent job naming with prefixes across all GitLab CI jobs.

Key Changes

Test Suite Reorganization

• Reorganized tests with hspec-like naming: it-<does-something>
• Moved from test/{positive,negative}/* to test/modules/{flake,gitlab-ci}/*
• Structure mirrors module hierarchy (modules.flake.* vs modules.gitlab-ci.*)
• Added positive tests for all validators (previously only had negative tests)
• Auto-discovery of child pipelines from test directory

Job Naming Improvements

• Implemented consistent job naming with prefixes:
  • build:* - Build jobs (e.g., build:omnix)
  • publish:* - Publishing jobs (e.g., publish:cachix)
  • validate:* - Validation jobs (e.g., validate:flake-lock, validate:flake-show, validate:flake-strict-inputs)
  • test:* - Test jobs (test:canary:, test:module:)
  • generate:* - Generation jobs
  • aggregate:* - Aggregation jobs
• Updated remote/gitlab-ci.yml to use colon-based naming convention

Module Improvements

• Made child-pipeline module path-agnostic (no hardcoded "test" assumptions)
• Updated module test to use canaries instead of cachix for better coverage
• Added lib.findFlakes function for recursive flake discovery

Additional Improvements

• Added verify stage to stage ordering (between test and publish)
• Added property test for expect-failure module
• Added expect-failure module for negative testing
• Refactored negative tests to use expect-failure module
• Added flake-lock and flake-show negative tests

See ChangeLog.md for complete details.

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