Adding builds for tv casting/server on PRs (#25698)

We want to ensure the example casting and server app are built on every
PR to ensure it doesn't break due to API changes. Enabling that here in
the smoke tests.

.github/workflows/smoketest-android.yaml

@@ -82,3 +82,11 @@ jobs:
               run: |
                   ./scripts/run_in_build_env.sh \
                     "ninja -C out/android-arm64-chip-tool build/chip/java/tests:java_build_test"
+            - name: Build Android arm64-tv-casting-app
+              run: |
+                  ./scripts/run_in_build_env.sh \
+                    "./scripts/build/build_examples.py --target android-arm64-tv-casting-app build"
+            - name: Build Android arm64-tv-server
+              run: |
+                  ./scripts/run_in_build_env.sh \
+                    "./scripts/build/build_examples.py --target android-arm64-tv-server build"