[ci] do not block pull requests on cache_bitstreams #3599

Job	Run time
Lint (quick)	3m 22s
Verible lint	1m 1s
Run OTBN crypto tests	3m 23s
Run OTBN smoke Test	2m 54s
Lint (slow)	14m 3s
Airgapped build	12m 32s
Verilated English Breakfast	7m 59s
Build Docker Containers	2m 45s
CW305's Bitstream	21m 25s
Build and test software	16m 51s
Verilated Earl Grey	1h 1m 45s
Merge blocker	1s
Earl Grey for CW310 / Build bitstream	1m 49s
Earl Grey for CW310 Hyperdebug / Build bitstream	1m 59s
Earl Grey for CW340 / Build bitstream	2m 0s
CW310 ROM Tests / FPGA test	39m 29s
CW310 Test ROM Tests / FPGA test	3m 32s
CW310 ROM_EXT Tests / FPGA test	7m 10s
CW310 SiVal ROM_EXT Tests / FPGA test	34m 30s
CW310 Manufacturing Tests / FPGA test	30m 42s
CW310 SiVal Tests / FPGA test	21m 42s
Cache bitstreams to GCP	0s
CW340 ROM_EXT Tests / FPGA test	3m 17s
CW340 Manufacturing Tests / FPGA test	7m 36s
CW340 ROM Tests / FPGA test	1m 2s
CW340 SiVal Tests / FPGA test	16m 55s
CW340 SiVal ROM_EXT Tests / FPGA test	3m 20s
CW340 Test ROM Tests / FPGA test	3m 2s
Merge blocker${{ (((github.event_name != 'merge_group') && ' (skipped)') \|\| '') }}	0s
Verify FPGA jobs	23s
	5h 26m 29s

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