Migrate to Go Modules + Off of Smithy-runner

[matthinrichsen-wf]

Moves from

• glide -> go mod
• smithy-runner -> golang

Passing CI should be sufficient for this change

[aviary2-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure

• Verify aviary.yaml coverage of security relevant code

  Questions or Comments? Reach out on Slack: #support-infosec.

[matthinrichsen-wf]

@Workiva/release-management-p