Update workflows to ensure backward compatibility

.github/workflows/tests.yaml

@@ -30,7 +30,8 @@ jobs:
 
       - name: Recompile Workers
         run: |
-          dart run isolate_manager:generate -i test -o test
+          dart run isolate_manager:generate -i test -o test --worker-mappings-experiment=test/isolate_manager_test.dart
+          dart run isolate_manager:generate -i test -o test --worker-mappings-experiment=test/isolate_manager_shared_test.dart
           dart run isolate_manager:generate -i test -o test/workers
 
       - name: Run tests on VM

.github/workflows/tests_v6.0.0.yaml

@@ -25,9 +25,13 @@ jobs:
       - name: Analyze
         run: dart analyze
 
-      - name: Compile Workers
+      - name: Run tests on Chrome for the old Workers
+        run: dart test --platform=chrome
+
+      - name: Recompile Workers
         run: |
-          dart run isolate_manager:generate -i test -o test
+          dart run isolate_manager:generate -i test -o test --worker-mappings-experiment=test/isolate_manager_test.dart
+          dart run isolate_manager:generate -i test -o test --worker-mappings-experiment=test/isolate_manager_shared_test.dart
           dart run isolate_manager:generate -i test -o test/workers
 
       - name: Run tests on VM
@@ -39,7 +43,7 @@ jobs:
       - name: Format coverage
         run: dart run coverage:format_coverage --lcov --in=coverage --out=coverage/lcov.info --packages=.dart_tool/package_config.json --report-on=lib --check-ignore
 
-      - name: Covert to relative paths
+      - name: Convert to relative paths
         run: sed -i 's|SF:.*/lib|SF:lib|' coverage/lcov.info
 
       - name: Show code coverage reports