misc: Implement two-pass linking to separate rodata sections. #706

Job	Run time
Build and package cores	9m 27s
Split off zephyr_main	9s
Split off zephyr	17s
Split off zephyr_contrib	8s
Split off zephyr_unoq	12s
Test zephyr_main:portentac33	2m 33s
Test zephyr_main:opta	2m 33s
Test zephyr_main:portentah7	2m 35s
Test zephyr_main:nano33ble	2m 33s
Test zephyr_main:giga	2m 39s
Test zephyr_main:niclasense	2m 29s
Test zephyr_contrib:frdm_mcxn947	2m 27s
Test zephyr_contrib:frdm_rw612	2m 22s
Test zephyr:unoq	2m 21s
Test zephyr_contrib:ek_ra8d1	2m 24s
Collect logs	10s
verify-core	4s
cleanup-artifacts	6s
Publish jsons	0s
Publish core	0s
	35m 29s

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