Unnecessary `#if CONFIG_FOO == 1` checks were removed and the
statements were simplified to` #if CONFIG_FOO`.
`#ifdef CONFIG_FOO` statements were also changed to `#if CONFIG_FOO`
to keep the style as uniform as possible.
Refs #1085
The config parameter names defined in the relay_chn_defs.h file
have been changed back to their original names (with the CONFIG_ prefix),
so that they are not confused with application-level defines.
Refs #1085
- Removed unnecessary calls to relay_chn_create and g_is_component_initialized in multiple test cases across test_relay_chn_core_single.c, test_relay_chn_listener_multi.c, and test_relay_chn_listener_single.c.
- Introduced new test files for NVS functionality: test_relay_chn_nvs_multi.c and test_relay_chn_nvs_single.c, covering initialization, direction setting, invalid parameters, and erase operations.
- Updated partition table configuration to support NVS storage, including the addition of a new partition file part_nvs.csv.
- Adjusted sdkconfig files to enable NVS support and configure custom partition settings for relay channels.
Break down tests into categories to improve maintainability and test granularity. This makes it easier to execute unit tests in CI/CD pipelines.
Closes #1054.
