Split the unit/font tests into per-browser jobs

This commit mirrors the approach from e656b833 to the other workflows
that run multiple OS/browser combinations. This approach has multiple
advantages:

- it improves performance because each job is run in its own environment
  so we don't have two browsers competing for resources in the same
  environment anymore;
- it improves monitoring because each job is shown separately, with its
  own runtime, in e.g. the pull request checks and actions overviews,
  which makes it easier to spot bottlenecks that are specific to a
  certain OS/browser combination and enable follow-up optimizations.

.github/workflows/font_tests.yml

@@ -24,13 +24,19 @@ permissions:
 
 jobs:
   test:
-    name: Test
+    name: ${{ matrix.os }} / ${{ matrix.browser }}
 
     strategy:
       fail-fast: false
       matrix:
         node-version: [lts/*]
         os: [windows-latest, ubuntu-latest]
+        browser: [firefox, chrome]
+        include:
+          - browser: firefox
+            skip: --noChrome
+          - browser: chrome
+            skip: --noFirefox
 
     runs-on: ${{ matrix.os }}
     environment: code-coverage
@@ -62,7 +68,7 @@ jobs:
         run: pip install -r .github/font_tests_requirements.txt
 
       - name: Run font tests with code coverage
-        run: npx gulp fonttest --headless --coverage --coverage-output build/coverage/font
+        run: npx gulp fonttest --headless --coverage --coverage-output build/coverage/font ${{ matrix.skip }}
 
       - name: Upload results to Codecov
         uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2 # v6.0.0

.github/workflows/unit_tests.yml

@@ -26,13 +26,19 @@ permissions:
 
 jobs:
   test:
-    name: Test
+    name: ${{ matrix.os }} / ${{ matrix.browser }}
 
     strategy:
       fail-fast: false
       matrix:
         node-version: [lts/*]
         os: [windows-latest, ubuntu-latest]
+        browser: [firefox, chrome]
+        include:
+          - browser: firefox
+            skip: --noChrome
+          - browser: chrome
+            skip: --noFirefox
 
     runs-on: ${{ matrix.os }}
     environment: code-coverage
@@ -63,7 +69,7 @@ jobs:
           enableCrossOsArchive: true
 
       - name: Run unit tests with code coverage
-        run: npx gulp unittest --headless --coverage --coverage-output build/coverage/unit
+        run: npx gulp unittest --headless --coverage --coverage-output build/coverage/unit ${{ matrix.skip }}
 
       - name: Save cached PDF files
         uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5