Migrate legacy config path to the new canonical location.
If the old path {configRoot}/jeeves-meta.config.json exists and the new
path {configRoot}/jeeves-meta/config.json does NOT exist, copies the file
to the new location and logs a warning.
Parameters
configRoot: string
Root directory for configuration files.
Optionalwarn: (msg:string)=>void
Optional callback for logging the migration warning.
Migrate legacy config path to the new canonical location.
If the old path
{configRoot}/jeeves-meta.config.jsonexists and the new path{configRoot}/jeeves-meta/config.jsondoes NOT exist, copies the file to the new location and logs a warning.