[BlockStitcher] Work arounds to address stitching issues in latest Vivado 2024.2

[clavin-xlnx]

This is a few fixes/work arounds to enable the BlockStitcher to run on 2024.2 designs from Vivado.

1. Consolidate the final netlist set of cells to the work library and update all references of the work library to the canonical instance in the netlist.
2. Change the name of the design to match the incoming netlist top cell name.
3. Works around a reference issue for pass-thru port connections where the EDIFPortInst has a null reference to its EDIFCellInst. It works around this issue by referencing the EDIFCellInst in the EDIFHierCellInst instead.
4. The BlockStitcher relies on operating on a null netlist, however, modern changes do not allow this. A work around is added that puts a temporary 'dummy' netlist in place and then removes it.

See also #1124.