Remove hard-coded ami option in favor of ssm in circleci

[dakotabenjamin]

What type of PR is this? (check all applicable)

• [ ] 🍕 Feature
• [ ] 🐛 Bug Fix
• [ ] 📝 Documentation
• [ ] 🧑‍💻 Refactor
• [ ] ✅ Test
• [x] 🤖 Build or CI
• [ ] ❓ Other (please specify)

Describe this PR

Fixing an error in the CircleCI config where we were hard-coding the AMI. Now that it's set automatically by SSM, there is no need for this code.

Review Guide

I've set this branch to deploy to dev, so if the deployment here passes then we are good to go.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud