As found with recent changes to the Terraform manager, although we
generally have `lockFileMaintenance` being executed by an external
package manager being invoked by `exec(...)`, there are a few package
managers that do not do so.
To make it very clear how this happens, we can add a new field to the
Manager API, which will provide a means to document this.
Co-authored-by: Claude Sonnet 5 <jamie.tanna+claude-code@mend.io>