Remove orphaned constants

[esquith]

Before contributing, please read our contributing guidelines and code of conduct.

Overview

For #1130

Submitter Checklist:

• Include a link to the related GitHub issue, if applicable
• Include a security review link, if applicable

Testing

The agent includes a suite of unit and functional tests which should be used to
verify your changes don't break existing functionality. These tests will run with
Github Actions when a pull request is made. More details on running the tests locally can be found
here for our unit tests,
and here for our functional tests.
For most contributions it is strongly recommended to add additional tests which
exercise your changes.

Reviewer Checklist

• Perform code review
• Add performance label
• Perform appropriate level of performance testing
• Confirm all checks passed
• Add version label prior to acceptance

[fallwith]

Thank you for these changes, @esquith. This project goes back a long way and it's great to see these no-longer-used values get cleaned up.