misc: Optimize flash and memory usage. #808

Job	Run time
Build and package cores	9m 21s
Split off zephyr	19s
Split off zephyr_contrib	11s
Split off zephyr_unoq	7s
Split off zephyr_main	7s
Test zephyr_main:opta	2m 35s
Test zephyr_main:nano33ble	2m 25s
Test zephyr_contrib:ek_ra8d1	2m 20s
Test zephyr_main:portentah7	2m 33s
Test zephyr_main:niclasense	2m 31s
Test zephyr:unoq	2m 21s
Test zephyr_main:portentac33	2m 35s
Test zephyr_main:giga	2m 31s
Test zephyr_contrib:frdm_rw612	2m 22s
Test zephyr_contrib:frdm_mcxn947	2m 26s
Collect logs	9s
Publish jsons	13s
verify-core	0s
Publish core	0s
cleanup-artifacts	5s
	35m 11s

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