Fix CICD Pipeline: Upgrade Ubuntu version on Azure DevOps agent, Go dependency errors, and more

[shubydo]

Proposed changes

Fix issues in CICD pipeline causing builds and status checks to fail, blocking new features from being merged.

• Upgrade Ubuntu agent version to 20.04

  • 16.04 has been decommissioned in October 2021. More info here.

• Fix errors in pipeline when fetching Go dependencies for current linting tools

  • Go 1.15 and 1.16 are deprecated, causing newer versions of linting tools to fail when installing. NOTE: Project has been upgraded to1.17 as part of resolving these errors.

• Fix conflict error when deploying/updating application code preventing publishing new version of Lambda function

  • Example of error: An error occurred (ResourceConflictException) when calling the PublishVersion operation: The operation cannot be performed at this time. An update is in progress for resource: arn:aws:lambda:....

• Fix issue in PR pipeline where newly leased ephemeral AWS account is not being used when setting up infra for testing. (Current understanding of problem here)

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (changes to code, which do not change application behavior)

Checklist

• I have filled out this PR template
• I have read the CONTRIBUTING doc
• I have added automated tests that prove my fix is effective or that my feature works
• I have added necessary documentation (README.md, inline comments, etc.)
• I have updated the CHANGELOG.md under a ## next release, with a short summary of my changes

Relevant Links

Further comments

[CLAassistant]

All committers have signed the CLA.

[eric-w-hart]

@shubydo Can you complete the Checklist segement?
@nathanagood could you do a review for this PR?
Thanks,

[shubydo]

@eric-w-hart @nathanagood pipeline is having some errors when trying to install the linting tools. Still needs to be fixed before the checks will pass

[eric-w-hart]

@eric-w-hart @nathanagood pipeline is having some errors when trying to install the linting tools. Still needs to be fixed before the checks will pass

golang lint is throwing an error and Terraform is out of date.
Researching both.

[shubydo]

@eric-w-hart @nathanagood pipeline is having some errors when trying to install the linting tools. Still needs to be fixed before the checks will pass

golang lint is throwing an error and Terraform is out of date. Researching both.

@eric-w-hart @nathanagood This is now fixed. It's now pending deployment here. Needs an approval.

Let's get the pipeline passing as part of this PR and do the terraform upgrade in subsequent PRs. Once the pipeline is fixed this will help unblock the pending PRs.