[bazel] Add QEMU execution environment #4497

Job	Run time
Lint (quick)	3m 18s
Verible lint	1m 5s
Lint (slow)	7m 32s
Build documentation	9m 10s
Airgapped build	5m 9s
Run OTBN crypto tests	23m 27s
Run OTBN smoke Test	2m 33s
Verilated Earl Grey	1h 23m 9s
Verilated English Breakfast	12m 13s
Build Docker Containers	2m 23s
CW305's Bitstream	21m 51s
Build and test software	2m 34s
QEMU ROM Tests	1m 25s
Earl Grey for CW310 / Build bitstream	1h 14m 35s
Earl Grey for CW310 Hyperdebug / Build bitstream	1h 7m 47s
Earl Grey for CW340 / Build bitstream	1h 30m 57s
CW310 SiVal Tests / FPGA test	3m 34s
CW310 ROM_EXT Tests / FPGA test	3m 24s
CW310 SiVal ROM_EXT Tests / FPGA test	3m 34s
CW310 Manufacturing Tests / FPGA test	3m 37s
CW310 ROM Tests / FPGA test	2m 50s
CW310 Test ROM Tests / FPGA test	4m 39s
Cache bitstreams to GCP	0s
CW340 ROM Tests / FPGA test	44s
CW340 ROM_EXT Tests / FPGA test	2m 34s
CW340 Manufacturing Tests / FPGA test	2m 41s
CW340 SiVal Tests / FPGA test	2m 22s
CW340 SiVal ROM_EXT Tests / FPGA test	2m 25s
CW340 Test ROM Tests / FPGA test	3m 37s
Verify FPGA jobs	21s
	7h 25m 30s

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