samples: prepare for NCS bump to 2.4.0

golioth / golioth-zephyr-sdk

Golioth SDK For Zephyr

Apache License 2.0

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There are some minor issues when trying to bump NCS to 2.4.0:

CONFIG_NET_SHELL=y results in build failure, so this PR includes a commit that sets this option via Kconfig, instead of prj.conf (this also deduplicates lots of configuration),
void main() functions result in build warnings, so this PR includes a conversion to int main(), which is what upstream Zephyr switched to,
~~CONFIG_LTE_AUTO_INIT_AND_CONNECT=y got deprecated in NCS 2.4.0, so there is a commit to stop using it; this also improves consistency with WiFi mgmt APIs, which are called by samples/common/ code as well.~~

golioth / golioth-zephyr-sdk