[prim] Remove primgen and replace with virtual cores #3548

Job	Run time
Lint (quick)	3m 40s
Airgapped build	9m 33s
Lint (slow)	7m 46s
Build documentation	5m 22s
Verible lint	2m 9s
Verilated Earl Grey	3m 40s
Run OTBN smoke Test	1m 30s
Run OTBN crypto tests	21m 40s
Verilated English Breakfast	1m 1s
Build Docker Containers	3m 1s
CW305's Bitstream	21m 25s
Build and test software	16m 11s
Earl Grey for CW310 / Build bitstream	1h 3m 40s
Earl Grey for CW310 Hyperdebug / Build bitstream	1h 8m 43s
Earl Grey for CW340 / Build bitstream	1h 34m 30s
CW310 Test ROM Tests / FPGA test	2m 46s
CW310 ROM Tests / FPGA test	3m 4s
CW310 ROM_EXT Tests / FPGA test	2m 39s
CW310 Manufacturing Tests / FPGA test	3m 21s
CW310 SiVal ROM_EXT Tests / FPGA test	3m 17s
CW310 SiVal Tests / FPGA test	3m 31s
Cache bitstreams to GCP	0s
CW340 ROM Tests / FPGA test	53s
CW340 Manufacturing Tests / FPGA test	2m 57s
CW340 SiVal Tests / FPGA test	2m 58s
CW340 ROM_EXT Tests / FPGA test	2m 57s
CW340 SiVal ROM_EXT Tests / FPGA test	2m 13s
CW340 Test ROM Tests / FPGA test	2m 3s
Verify FPGA jobs	29s
	5h 56m 59s

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