[provisioning] make extension CA config optional #3558

Job	Run time
Lint (quick)	3m 24s
Verible lint	58s
Run OTBN crypto tests	21m 35s
Run OTBN smoke Test	3m 1s
Airgapped build	12m 56s
Build documentation	4m 59s
Lint (slow)	11m 19s
Verilated English Breakfast	7m 57s
Verilated Earl Grey	1h 16m 18s
Build Docker Containers	2m 40s
Build and test software	12m 23s
CW305's Bitstream	21m 29s
Earl Grey for CW310 / Build bitstream	2m 1s
Earl Grey for CW310 Hyperdebug / Build bitstream	2m 2s
Earl Grey for CW340 / Build bitstream	1m 59s
CW310 ROM_EXT Tests / FPGA test	5m 24s
CW310 Test ROM Tests / FPGA test	6m 27s
CW310 ROM Tests / FPGA test	29m 39s
CW310 Manufacturing Tests / FPGA test	33m 55s
CW310 ROM_EXT Tests / FPGA test	13m 55s
CW310 SiVal Tests / FPGA test	31m 48s
CW310 SiVal ROM_EXT Tests / FPGA test	39m 18s
Cache bitstreams to GCP	0s
CW340 ROM_EXT Tests / FPGA test	45s
CW340 ROM Tests / FPGA test	54s
CW340 SiVal Tests / FPGA test	4m 58s
CW340 Test ROM Tests / FPGA test	2m 21s
CW340 Manufacturing Tests / FPGA test	11m 0s
CW340 SiVal ROM_EXT Tests / FPGA test	50s
Verify FPGA jobs	22s
	6h 6m 37s

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