misc: Optimize flash and memory usage. #809

Job	Run time
Build and package cores	9m 27s
Split off zephyr_main	15s
Split off zephyr_unoq	15s
Split off zephyr_contrib	14s
Split off zephyr	10s
Test zephyr_main:niclasense	2m 34s
Test zephyr_main:nano33ble	2m 28s
Test zephyr_contrib:ek_ra8d1	2m 18s
Test zephyr_main:opta	2m 27s
Test zephyr_main:giga	1m 57s
Test zephyr_main:portentac33	2m 30s
Test zephyr_contrib:frdm_mcxn947	2m 23s
Test zephyr_contrib:frdm_rw612	2m 18s
Test zephyr_main:portentah7	2m 35s
Test zephyr:unoq	2m 32s
Collect logs	7s
Publish jsons	21s
Publish core	0s
verify-core	0s
cleanup-artifacts	5s
	34m 56s

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