Revert "ci: Merge testing actions"

This reverts commit f2d165aa60.

.github/workflows/testing.yml

@@ -1,56 +0,0 @@
-name: Combined Testing
-
-on:
-    push:
-        branches: [ "dev" ]
-    pull_request:
-        branches: [ "dev" ]
-        types: ["synchronize", "ready_for_review", "opened", "reopened"]
-
-jobs:
-    backend-test:
-        name: Run backend unit tests
-        if: "! github.event.pull_request.draft"
-        runs-on: [self-hosted, Linux, X64]
-        strategy:
-            matrix:
-                node-version: [22.x]
-        steps:
-            - uses: actions/checkout@v4
-            - name: Use Node.js ${{ matrix.node-version }}
-              uses: actions/setup-node@v4
-              with:
-                  node-version: ${{ matrix.node-version }}
-                  cache: 'npm'
-            - run: npm ci
-            - run: npm run test:unit -w backend
-        paths:
-            - 'backend/src/**.[jt]s'
-            - 'backend/tests/**.[jt]s'
-            - 'backend/vitest.config.ts'
-
-    frontend-test:
-        name: Run frontend unit tests
-        if: "! github.event.pull_request.draft"
-        runs-on: [self-hosted, Linux, X64]
-        strategy:
-            matrix:
-                node-version: [22.x]
-        steps:
-            - uses: actions/checkout@v4
-            - name: Use Node.js ${{ matrix.node-version }}
-              uses: actions/setup-node@v4
-              with:
-                  node-version: ${{ matrix.node-version }}
-                  cache: 'npm'
-            - run: npm ci
-            - run: npm run test:unit -w frontend
-        paths:
-            - 'frontend/src/**.[jt]s'
-            - 'frontend/src/**.vue'
-            - 'frontend/src/**.css'
-            - 'frontend/tests/**.[jt]s'
-            - 'frontend/tests/**.vue'
-            - 'frontend/tests/**.css'
-            - 'frontend/vitest.config.ts'
-            - 'frontend/playwright.config.ts'