misc: Optimize flash and memory usage. #806

Job	Run time
Build and package cores	10m 54s
Split off zephyr_main	15s
Split off zephyr	9s
Split off zephyr_contrib	16s
Split off zephyr_unoq	6s
Test zephyr_main:portentah7	2m 30s
Test zephyr_main:portentac33	2m 26s
Test zephyr:unoq	2m 18s
Test zephyr_contrib:frdm_rw612	1m 41s
Test zephyr_main:giga	2m 39s
Test zephyr_contrib:ek_ra8d1	2m 20s
Test zephyr_main:opta	2m 34s
Test zephyr_contrib:frdm_mcxn947	2m 21s
Test zephyr_main:niclasense	2m 37s
Test zephyr_main:nano33ble	2m 27s
Publish jsons	16s
Collect logs	10s
Publish core	0s
verify-core	0s
cleanup-artifacts	4s
	36m 3s

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