### Summary Limit e2e tests concurrency to 1 ### Why is this needed? If multiple e2e test workflows run in parallel they can interfere with the infrastructure and fail. ### Which area does this relate to? _No response_ ### Solution _No response_ ### Acknowledgment - [x] This request meets [Powertools for AWS Lambda (.NET) Tenets](https://docs.powertools.aws.dev/lambda/dotnet/#tenets)