misc: Implement two-pass linking to separate rodata sections. #708

Job	Run time
Build and package cores	9m 31s
Split off zephyr_unoq	7s
Split off zephyr_contrib	9s
Split off zephyr	18s
Split off zephyr_main	10s
Test zephyr_main:portentac33	2m 56s
Test zephyr_main:nano33ble	2m 32s
Test zephyr_contrib:frdm_mcxn947	2m 31s
Test zephyr_main:portentah7	2m 30s
Test zephyr_main:opta	1m 56s
Test zephyr_main:giga	2m 31s
Test zephyr_contrib:ek_ra8d1	2m 32s
Test zephyr:unoq	1m 43s
Test zephyr_contrib:frdm_rw612	1m 50s
Test zephyr_main:niclasense	1m 59s
verify-core	4s
Collect logs	7s
Publish jsons	0s
Publish core	0s
cleanup-artifacts	3s
	33m 29s

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