codebase: Remove web frontend and related services (#2067)

* codebase: Remove web frontend and related services

* refactor: Update StartPPROF to accept context and adjust related tests

* refactor: Simplify SetIfZero functions and update related tests

* config: Clarify DowngradeConfig method documentation regarding permanent removal of deprecated fields

* refactor: Rename setIfZeroAndWarn to setDefaultIfZeroWarn for clarity and update related calls

* refactor: Update error handling in DataHistoryManager and remove redundant error variable

.github/workflows/tests.yml

@@ -158,27 +158,3 @@ jobs:
       run: |
         docker run --env SKIP_WRAPPER_CI_TESTS=true --env CI=true --env GCT_DOCKER_CI=true --rm gct-backend-amd64
 
-  frontend:
-    name: GoCryptoTrader frontend
-    runs-on: ubuntu-latest
-    steps:
-    - name: Cancel previous workflow runs
-      uses: styfle/cancel-workflow-action@0.12.1
-      with:
-        access_token: ${{ github.token }}
-
-    - uses: actions/checkout@v5
-
-    - name: Use Node.js
-      uses: actions/setup-node@v5
-      with:
-        node-version: '10.8.x'
-        cache: 'npm'
-        cache-dependency-path: web/package-lock.json
-
-    - name: Build
-      run: | 
-        cd web/
-        npm install
-        npm run lint
-        npm run build