[Serverless] Add ARM integration tests for the lambda extension

[thedavlee]

What does this PR do?

Adds integration tests covering the ARM lambda extension. This modifies the existing serverless github workflow to run the arm tests in parallel.

• Existing amd64 integration test snapshots were not modified, only changed location

Motivation

Adding ARM coverage for the extension will help us catch potentially missed bugs in the future.

Additional Notes

The log-csharp integration test would commonly fail with the error:

LAMBDA_RUNTIME Failed to get next invocation. No Response from endpoint
"message": "An error occurred while attempting to execute your code.: LambdaException",
"message": "terminate called after throwing an instance of 'std::logic_error'"
"message": "what():  basic_string::_M_construct null not valid"

• Other non log csharp tests filter out this error, so it only appears in log-csharp
• This is an issue with the lambda extension doing work when a SHUTDOWN event is received (in the allowed two seconds), and looks like an issue on the AWS side. We will ignore the error for now.

Possible Drawbacks / Trade-offs

Describe how to test/QA your changes

Reviewer's Checklist

• If known, an appropriate milestone has been selected; otherwise the Triage milestone is set.
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• Use the major_change label if your change either has a major impact on the code base, is impacting multiple teams or is changing important well-established internals of the Agent. This label will be use during QA to make sure each team pay extra attention to the changed behavior. For any customer facing change use a releasenote.
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• Changed code has automated tests for its functionality.
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• If applicable, docs team has been notified or an issue has been opened on the documentation repo.
• If applicable, the need-change/operator and need-change/helm labels have been applied.
• If applicable, the config template has been updated.

[bits-bot]

All committers have signed the CLA.

[nhinsch]

👌

[nhinsch]

What does this env var do?

[thedavlee]

This is a remnant from some debugging oops, let me remove that