Add more checks when people use the flow to import jobs created manually

[b-per]

If we have a staging and prod env, the tool can be used so that jobs are created manually in staging and they can be promoted to prod using import-jobs and plan/sync.

But once some jobs have been promoted the import-jobs need to be filtering on the specific staging env id, otherwise changes done in staging to already moved to prod jobs are not getting reflected.

We should provider some warnings/errors and path to resolution when we realize that the import-jobs filter is missing the env filter.