Fix isLatest calculation in CI and move tool to new CLI

[tylerbutler]

Replaces PR #11537

Alternative approach to fixing the isLatest calculation in CI.

1. Refactored existing buildVersion command to a lib module and a main module, to make it easier to export the minimum stuff from build-tools.
2. Created a new command in the new CLI tools, generate buildVersion.
3. Updated CI to install the new build-cli package as part of the pipeline.
4. Use new CLI to run buildVersion in CI.