[ci] do not block pull requests on cache_bitstreams #3564

Job	Run time
Lint (quick)	3m 11s
Verible lint	4m 45s
Lint (slow)	14m 22s
Run OTBN crypto tests	2m 42s
Airgapped build	9m 9s
Verilated Earl Grey	1h 4m 10s
Run OTBN smoke Test	2m 29s
Verilated English Breakfast	8m 51s
Build Docker Containers	3m 1s
Merge blocker	1s
Build and test software	16m 23s
CW305's Bitstream	21m 35s
Earl Grey for CW310 / Build bitstream	1m 49s
Earl Grey for CW310 Hyperdebug / Build bitstream	1m 53s
Earl Grey for CW340 / Build bitstream	1m 52s
CW310 Test ROM Tests / FPGA test	3m 51s
CW310 ROM Tests / FPGA test	39m 56s
CW310 ROM_EXT Tests / FPGA test	6m 14s
CW310 SiVal ROM_EXT Tests / FPGA test	38m 21s
CW310 SiVal Tests / FPGA test	22m 57s
CW310 Manufacturing Tests / FPGA test	31m 20s
Cache bitstreams to GCP	0s
CW340 ROM Tests / FPGA test	48s
CW340 Manufacturing Tests / FPGA test	6m 16s
CW340 ROM_EXT Tests / FPGA test	2m 42s
CW340 Test ROM Tests / FPGA test	2m 58s
CW340 SiVal ROM_EXT Tests / FPGA test	3m 29s
CW340 SiVal Tests / FPGA test	16m 50s
Merge blocker	0s
Verify FPGA jobs	21s
	5h 32m 16s

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