Remove testing apps since CI will generate them now

.github/workflows/ci.yml

@@ -6,16 +6,24 @@ on:
       - main
   workflow_call:
 
+# Cancel active CI runs for a PR before starting another run
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
 defaults:
   run:
-    shell: bash  # https://github.com/beeware/briefcase/pull/912
+    shell: bash
+
+env:
+  FORCE_COLOR: "1"
 
 jobs:
   pre-commit:
     name: Pre-commit checks
     uses: beeware/.github/.github/workflows/pre-commit-run.yml@main
     with:
-      pre-commit-source: "pre-commit"
+      pre-commit-source: pre-commit
 
   verify-apps:
     name: Build apps
@@ -31,16 +39,4 @@ jobs:
       fail-fast: false
       matrix:
         python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12" ]
-        # PySide2 doesn't publish a binary wheel that is compatible
-        # with Python 3.11+, and doesn't publish *any* universal or ARM64 wheels,
-        # and is unlikely to ever do so, so we can't test pyside2.
         framework: [ "toga", "pyside6", "ppb", "pygame" ]
-        exclude:
-          # PySide6 hasn't published a binary wheel that is compatible
-          # with Python 3.12 yet.
-          - python-version: "3.12"
-            framework: "pyside6"
-          # Pygame hasn't published a binary wheel that is compatible
-          # with Python 3.12 yet.
-          - python-version: "3.12"
-            framework: "pygame"