misc: Optimize flash and memory usage. #811

Job	Run time
Build and package cores	10m 10s
Split off zephyr_contrib	15s
Split off zephyr	16s
Split off zephyr_main	14s
Split off zephyr_unoq	13s
Test zephyr_main:giga	2m 29s
Test zephyr_main:nano33ble	2m 23s
Test zephyr_main:opta	1m 56s
Test zephyr:unoq	2m 25s
Test zephyr_main:portentac33	2m 33s
Test zephyr_main:niclasense	2m 36s
Test zephyr_contrib:ek_ra8d1	2m 24s
Test zephyr_main:portentah7	2m 27s
Test zephyr_contrib:frdm_mcxn947	2m 25s
Test zephyr_contrib:frdm_rw612	2m 26s
Collect logs	10s
Publish jsons	14s
verify-core	0s
Publish core	0s
cleanup-artifacts	3s
	35m 39s

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