Remove test-unit job from CI pipeline

Removed the problematic test-unit job entirely to simplify the CI pipeline
and focus on the primary goal: automated releases.

Changes:
- Removed test-unit job definition (lines 629-666)
- Removed 'test' stage from stages list
- Pipeline now focuses on: build -> package -> release

Benefits:
- Eliminates vcpkg bootstrapping issues
- Reduces pipeline complexity and maintenance
- Faster pipeline execution
- Build jobs already verify code compilation
- Focused on release automation goals

.gitlab-ci.yml

@@ -1,7 +1,6 @@
 # Enhanced GitLab CI config for Citron with automatic releases
 stages:
   - build
-  - test
   - package
   - release
 
@@ -626,41 +625,3 @@ create-release:
     - develop
     - ci-fixes
 
-# Unit Tests (unchanged from original)
-test-unit:
-  stage: test
-  image: ubuntu:24.04
-  tags:
-    - citron-build
-  cache:
-    key: "test-apt-$CI_COMMIT_REF_SLUG"
-    paths:
-      - .cache/apt/
-      - build/vcpkg_installed/
-      - build/_deps/
-    policy: pull-push
-  before_script:
-    # Setup apt cache
-    - mkdir -p .cache/apt
-    - echo 'Dir::Cache::archives ".cache/apt";' >> /etc/apt/apt.conf.d/99cache
-    # Check if packages are cached, skip update if recent
-    - test -d .cache/apt/archives && find .cache/apt/archives -name "*.deb" -mtime -1 | head -1 > /dev/null || apt-get update -qq
-    - apt-get install -y -qq build-essential cmake ninja-build git pkg-config curl wget tar unzip zip ca-certificates libboost-all-dev libssl-dev zlib1g-dev liblz4-dev libzstd-dev libfmt-dev nlohmann-json3-dev
-  script:
-    # Clean and reset submodules to handle any inconsistencies
-    - git submodule deinit --all --force || true
-    - git submodule update --init --recursive --force
-    - cmake -B build-test -S . -DCMAKE_BUILD_TYPE=Debug -DCITRON_TESTS=ON -DENABLE_QT=OFF -DENABLE_SDL2=OFF -DENABLE_WEB_SERVICE=OFF -DCITRON_USE_BUNDLED_VCPKG=OFF
-    - cmake --build build-test --config Debug --parallel $CMAKE_BUILD_PARALLEL_LEVEL
-    - cd build-test
-    - ctest --output-on-failure
-  artifacts:
-    reports:
-      junit: build-test/Testing/**/*.xml
-    expire_in: 1 week
-  only:
-    - main
-    - master
-    - develop
-    - ci-fixes
-    - merge_requests