create check in precheck & tapeout flow to verify only expected layers exist for the process stack

[jeffdi]

[marwaneltoukhy]

Blocked on the complete list of valid layers that can be taped out. I think the complete list is not open sourced.

[DavidRLindley]

This check is coded in a PR. It is waiting on a layers file. Marwan to send a PR link to DL, DL to push closed.