[prim] Remove primgen and replace with virtual cores #3591

Job	Run time
Lint (quick)	3m 6s
Verible lint	1m 3s
Build documentation	5m 16s
Lint (slow)	12m 28s
Airgapped build	9m 29s
CW305's Bitstream	22m 15s
Verilated Earl Grey	1h 14m 51s
Run OTBN crypto tests	22m 1s
Run OTBN smoke Test	2m 48s
Verilated English Breakfast	7m 34s
Build Docker Containers	2m 36s
Build and test software	19m 23s
Earl Grey for CW310 / Build bitstream	1h 4m 44s
Earl Grey for CW310 Hyperdebug / Build bitstream	1h 4m 1s
Earl Grey for CW340 / Build bitstream	1h 36m 30s
CW310 SiVal ROM_EXT Tests / FPGA test	34m 29s
CW310 Manufacturing Tests / FPGA test	30m 26s
CW310 SiVal Tests / FPGA test	28m 24s
CW310 ROM Tests / FPGA test	41m 54s
CW310 ROM_EXT Tests / FPGA test	7m 43s
CW310 Test ROM Tests / FPGA test	6m 24s
Cache bitstreams to GCP	0s
CW340 Test ROM Tests / FPGA test	6m 48s
CW340 ROM Tests / FPGA test	1m 4s
CW340 ROM_EXT Tests / FPGA test	9m 17s
CW340 SiVal Tests / FPGA test	20m 36s
CW340 SiVal ROM_EXT Tests / FPGA test	4m 55s
CW340 Manufacturing Tests / FPGA test	6m 37s
Verify FPGA jobs	29s
	10h 7m 11s

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