misc: Implement two-pass linking to separate rodata sections. #704

Job	Run time
Build and package cores	9m 27s
Split off zephyr	9s
Split off zephyr_contrib	6s
Split off zephyr_main	8s
Split off zephyr_unoq	7s
Test zephyr_main:giga	2m 29s
Test zephyr_main:opta	2m 29s
Test zephyr_main:nano33ble	2m 27s
Test zephyr_main:portentah7	2m 32s
Test zephyr_main:portentac33	2m 43s
Test zephyr_contrib:frdm_mcxn947	2m 31s
Test zephyr_main:niclasense	2m 32s
Test zephyr_contrib:ek_ra8d1	2m 31s
Test zephyr_contrib:frdm_rw612	2m 29s
Test zephyr:unoq	2m 32s
Collect logs	10s
Publish core	-1s
verify-core	2s
Publish jsons	-1s
cleanup-artifacts	3s
	35m 25s

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