Fix workflow file name

Author: harrryr

.github/workflows/main_build.yml

@@ -102,7 +102,7 @@ jobs:
   # Application Signals specific e2e tests for ec2
   application-signals-python-e2e-ec2-test:
     needs: [ build ]
-    uses: aws-observability/aws-application-signals-test-framework/.github/workflows/application-signals-python-e2e-ec2-test.yml@main
+    uses: aws-observability/aws-application-signals-test-framework/.github/workflows/application-signals-python-e2e-ec2-default-test.yml@main
     secrets: inherit
     with:
       aws-region: ${{ needs.build.outputs.aws_default_region }}