project: Add c8, switch to it in CI/CD.

Since coverage support is experimental in Node.js and CodeCov seem to
have trouble interpreting it, plus I am unsure whenever Node.js
actually generates a valid coverage file, use `c8` instead for the time
being. I switch to Node once it stabilizes and docs will claim this is
ready to be used in production.

Author: SpacingBat3

Diff for: .github/workflows/node-test.yml

@@ -27,20 +27,15 @@ jobs:
         run: "npm run build"
       - name: Run tests with coverage+test reporting
         run: |
-          npm test -- --experimental-test-coverage \
-            --test-reporter=lcov --test-reporter-destination=lcov.info \
+          npm run test:coverage -- --experimental-test-coverage \
             --test-reporter=spec --test-reporter-destination=stdout \
             --test-reporter=junit --test-reporter-destination=junit.xml
       - name: Upload coverage reports to Codecov
         uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
-          disable_search: true
-          files: lcov.info
       - name: Upload test results to CodeCov
         if: ${{ !cancelled() }}
         uses: codecov/test-results-action@v1
         with:
-          token: ${{ secrets.CODECOV_TOKEN }}
-          disable_search: true
-          file: junit.xml
+          token: ${{ secrets.CODECOV_TOKEN }}

Diff for: makers/appimage/package.json

@@ -6,7 +6,8 @@
   "main": "dist/main.js",
   "scripts": {
     "prepack": "tsc",
-    "test": "tsc -b tsconfig.test.json && NODE_NO_WARNINGS=1 node --test --experimental-strip-types"
+    "test": "tsc -b tsconfig.test.json && NODE_NO_WARNINGS=1 node --test --experimental-strip-types",
+    "test:coverage": "c8 -r json npm test --"
   },
   "repository": {
     "type": "git",