AWS .NET Mock Lambda Test Tool should set AWS_LAMBDA_FUNCTION_VERSION environment variable

### Describe the feature

AWS .NET Mock Lambda Test Tool should set AWS_LAMBDA_FUNCTION_VERSION environment variable

### Use Case

When instrumenting AWS Lambda functions with OpenTelemetry, this environment variable is used by the provided OpenTelemetry resource detector for AWS Lambda. If not set, the resource-detector throws an exception when configuring the TracerProviderBuilder. One needs to workaround, setting the environment variable e.g. within the launch options for the test tool.


### Proposed Solution

AWS Lambda Test Tool should set AWS_LAMBDA_FUNCTION_VERSION environment variable

### Other Information

_No response_

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### AWS .NET SDK and/or Package version used

Version shipped with AWS Toolkit for Visual Studio 2022 v 1.43.00

### Targeted .NET Platform

.NET 6

### Operating System and version

Windows 11