Model Integration succeeds when build actually failed

[jbelkins]

Describe the bug

The Model Integration CI task succeeds when its Swift build & test stage fails.

Example run: https://github.com/awslabs/aws-sdk-swift/actions/runs/5331072196/jobs/9658455576

It appears that after a failure, the test runner Swift CLI script does not fail with the appropriate error code.

Expected Behavior

Model build fails on error
Model Integration CI task fails on error as well

Current Behavior

Model build fails on error
Model Integration CI succeeds

Reproduction Steps

Push code that contains a Swift build error
Run "Model Integration" CI task manually on that commit

Possible Solution

Make the AWSSDKSwiftCLI test runner fail with the appropriate exit code

Additional Information/Context

No response

AWS SWIFT SDK version used

main / latest

Compiler and Version used

Xcode 14.3.1

Operating System and version

macOS 13.3

[jbelkins]

Shipped in AWS SDK for Swift 0.20.0